Template:Short description Template:Redirect Template:Use dmy dates Template:Infobox product A ballpoint pen, also known as a biro<ref name="About"/> (British English), ball pen (Hong Kong, Indian, Indonesian, Pakistani, and Philippine English), or dot pen<ref>Template:Cite journal</ref> (Nepali English and South Asian English), is a pen that dispenses ink (usually in paste form) over a metal ball at its point, i.e., over a "ball point". The metals commonly used are steel, brass, or tungsten carbide.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The design was conceived and developed as a cleaner and more reliable alternative to dip pens and fountain pens, and it is now the world's most-used writing instrument;<ref name="bpp encyc"/> millions are manufactured and sold daily.<ref name="How ballpoints work"/> It has influenced art and graphic design and spawned an artwork genre.
HistoryEdit
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OriginsEdit
The concept of using a "ball point" within a writing instrument to apply ink to paper has existed since the late 19th century. In these inventions, the ink was placed in a thin tube whose end was blocked by a tiny ball, held so that it could not slip into the tube or fall out of the pen.
The first patent for a ballpoint pen<ref>Collingridge, M. R. et al. (2007) "Ink Reservoir Writing Instruments 1905–20" Transactions of the Newcomen Society 77(1): pp. 69–100, p. 69</ref><ref>[Japes P. Mannings, "Reservoir, Fountain, and Stylographic Pens"], Journal of the Society of Arts, 27 October 1905, p. 1150</ref> was issued on 30 October 1888 to John J. Loud,<ref>Great Britain Patent No. 15630, 30 October 2008</ref> who was attempting to make a writing instrument that would be able to write "on rough surfaces—such as wood, coarse wrapping paper, and other articles"<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> which fountain pens could not. Loud's pen had a small rotating steel ball held in place by a socket. Although it could be used to mark rough surfaces such as leather, as Loud intended, it proved too coarse for letter-writing. With no commercial viability, its potential went unexploited,<ref name="About"/> and the patent eventually lapsed.<ref name="1940s"/>
The manufacture of economical, reliable ballpoint pens as are known today arose from experimentation, modern chemistry, and the precision manufacturing capabilities of the early 20th century.<ref name="bpp encyc"/> Patents filed worldwide during early development are testaments to failed attempts at making the pens commercially viable and widely available.<ref name="web"/> Early ballpoints did not deliver the ink evenly; overflow and clogging were among the obstacles faced by early inventorsTemplate:Who.<ref name="How ballpoints work"/> If the ball socket were too tight or the ink too thick, it would not reach the paper. If the socket were too loose or the ink too thin, the pen would leak, or the ink would smear.<ref name="How ballpoints work"/> Ink reservoirs pressurized by a piston, spring, capillary action, and gravity would all serve as solutions to ink-delivery and flow problems.<ref>Collingridge, M. R. et al. (2007). "Ink Reservoir Writing Instruments 1905–2005". Transactions of the Newcomen Society 77(1): pp. 69–100, p. 80</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
László Bíró, a Hungarian newspaper editor (later a naturalized Argentine) frustrated by the amount of time that he wasted filling up fountain pens and cleaning up smudged pages, noticed that inks used in newspaper printing dried quickly, leaving the paper dry and smudge-free. He decided to create a pen using the same type of ink.<ref name="How ballpoints work"/> Bíró enlisted the help of his brother György, a dentist with useful knowledge of chemistry,<ref>Collingridge, M. R. et al. (2007) "Ink Reservoir Writing Instruments 1905–2005". Transactions of the Newcomen Society 77(1): pp. 69–100, p. 81</ref> to develop viscous ink formulae for new ballpoint designs.<ref name="bpp encyc"/>
Bíró's innovation successfully coupled viscous ink with a ball-and-socket mechanism that allowed controlled flow while preventing ink from drying inside the reservoir.<ref name="How ballpoints work"/> Bíró filed for a British patent on 15 June 1938.<ref name="About"/><ref>"The first complete specifications appear to be UK 498997, June 1938 and UK 512218, December 1938; his rather basic Hungarian patent 120037 was dated April 1938." Collingridge, M. R. et al. (2007). "Ink Reservoir Writing Instruments 1905–2005". Transactions of the Newcomen Society 77(1): pp. 69–100, p. 80</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
In 1941, the Bíró brothers and a friend, Juan Jorge Meyne, fled Germany and moved to Argentina, where they formed "Bíró Pens of Argentina" and filed a new patent in 1943.<ref name="About"/> Their pen was sold in Argentina as the "Birome", from the names Bíró and Meyne, which is how ballpoint pens are still known in that country.<ref name="About"/> This new design was licensed by the British engineer Frederick George Miles and manufactured by his company Miles Aircraft, to be used by Royal Air Force aircrew as the "Biro".<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Ballpoint pens were found to be more versatile than fountain pens, especially in airplanes, where fountain pens were prone to leak.<ref name="How ballpoints work"/>
Bíró's patent, and other early patents on ballpoint pens, often used the term "ball-point fountain pen".<ref>Template:Cite bookTemplate:Self-published source</ref>Template:Self-published inline<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Postwar proliferationEdit
Following World War II, many companies vied to commercially produce their own ballpoint pen design. In pre-war Argentina, success of the Birome ballpoint was limited, but in mid-1945, the Eversharp Co., a maker of mechanical pencils, teamed up with Eberhard Faber Co. to license the rights from Birome for sales in the United States.<ref name="About"/><ref name="1940s"/>
In 1946, a Spanish firm, Vila Sivill Hermanos, began to make a ballpoint, Regia Continua, and from 1953 to 1957 their factory also made Bic ballpoints, on contract with the French firm Société Bic.<ref>Template:Cite news</ref>
During the same period, American entrepreneur Milton Reynolds came across a Birome ballpoint pen during a business trip to Buenos Aires, Argentina.<ref name="About"/><ref name="1940s"/> Recognizing commercial potential, he purchased several ballpoint samples, returned to the United States, and founded the Reynolds International Pen Company. Reynolds bypassed the Birome patent with sufficient design alterations to obtain an American patent, beating Eversharp and other competitors to introduce the pen to the US market.<ref name="About"/><ref name="1940s"/> Debuting at Gimbels department store in New York City on 29 October 1945,<ref name="1940s"/> for US$12.50 each (1945 US dollar value, about $Template:Inflation in Template:Inflation-year dollars),<ref name="1940s"/> "Reynolds Rocket" became the first commercially successful ballpoint pen.<ref name="About"/><ref name="How ballpoints work"/><ref>Template:Cite book</ref> Reynolds went to great extremes to market the pen, with great success; Gimbel's sold many thousands of pens within one week. In Britain, the Miles-(Harry) Martin pen company was producing the first commercially successful ballpoint pens there by the end of 1945.<ref name="About"/><ref>"Miles." Flight International, 28 August 1976, p. 513.</ref><ref>"The Biro Story." Template:Webarchive comcast.net. Retrieved: 25 April 2012.</ref>
Neither Reynolds' nor Eversharp's ballpoint lived up to consumer expectations in America. Ballpoint pen sales peaked in 1946, and consumer interest subsequently plunged due to market saturation, going from luxury good to fungible consumable.<ref name="1940s"/> By the early 1950s the ballpoint boom had subsided and Reynolds' company folded.<ref name="About"/>
Paper Mate pens, among the emerging ballpoint brands of the 1950s, bought the rights to distribute their own ballpoint pens in Canada.<ref name="intrigue"/> Facing concerns about ink-reliability, Paper Mate pioneered new ink formulas and advertised them as "banker-approved".<ref name="1940s"/> In 1954, Parker Pens released "The Jotter"—the company's first ballpoint—boasting additional features and technological advances which also included the use of tungsten-carbide textured ball-bearings in their pens.<ref name="About"/> In less than a year, Parker sold several million pens at prices between three and nine dollars.<ref name="About"/> In the 1960s, the failing Eversharp Co. sold its pen division to Parker and ultimately folded.<ref name="About"/>
Marcel Bich also introduced a ballpoint pen to the American marketplace in the 1950s, licensed from Bíró and based on the Argentine designs.<ref name="bpp encyc"/><ref name="Phaidon"/> Bich shortened his name to Bic in 1953, forming the ballpoint brand Bic now recognized globally.<ref name="How ballpoints work"/> Bic pens struggled until the company launched its "Writes First Time, Every Time!"<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> advertising campaign in the 1960s.<ref name="How ballpoints work"/> Competition during this era forced unit prices to drop considerably.<ref name="How ballpoints work"/>
In 2002, the Pakistani company Shaheen Group entered the pen market with the subsidiary Shaheen Ballpoints, as in Pakistan the ballpoint pen had a big demand but its quality was low. Shaheen had to compete with foreign companies that were in Pakistan for decades, such as Sayyed Engineers, Dollar Industries, Shahsons and Indus Pencils. The wholesale market bought their stocks in advance, but after six months the company had to pull their stocks due technical and marketing issues.<ref>Template:Cite journal</ref>
Production in ChinaEdit
Many industrial sites specialized in pen production were created in China. One important production site is the Fenshui Township. Their ballpoint pen production started in 1974, when the Hangzhou Ballpoint Pen Factory initiated its production using bamboo.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The Wengang Township has a long tradition of brush pen production,<ref>Template:Cite news</ref> but all kinds of pens are produced, including ballpoint pens.<ref>Template:Cite news</ref> In 2002, China's Pen Capital was constructed in Wenzhou, with an investment of ¥ 600 million. AIHAO was one of the first companies to move to the industrial site. Their most famous product is the ball-point pen.<ref name="world bank">Template:Cite book</ref>Template:Rp
In the 2000s, China ballpoint pen production skyrocketed. In 2017, China produced 38 billion ballpoint pens per year, 80% of the global market. But the country had a problem in doing precision engineering, including the ballpoint pen tip, that had to be imported from Germany, Switzerland and Japan for the cost of ¥ 120 million a year.<ref name="china daily">Template:Cite news</ref><ref name="TWSJ">Template:Cite news</ref><ref>Template:Cite news</ref> The subject was criticized by western media. Forbes argued that the lack of IP protections were the cause of it, as the country wouldn't attract investments in innovation.<ref>Template:Cite news</ref> Financial Times argued that because of Chinese self-sufficiency policy, companies handled the entire supply chain by themselves, thus creating inefficiency.<ref name="FT">Template:Cite news</ref> Hong Kong Economic Journal declared that "the day China can produce a 100% homemade ball pen will be the day it truly qualifies as a first-class industrial power".<ref name="sky news">Template:Cite news</ref>
Since 2011, the Ministry of Science and Technology invested $8.7 million in the production of the tips. Beifa Group worked with Taiyuan Iron & Steel Group (TISCO) with no success.<ref name="TWSJ"/> In 2016, the Chinese Premier Li Keqiang complained on national television about the quality of Chinese pens.<ref name="sky news"/> In June 2016, TISCO produced the first national ballpoint pen. In November, TISCO's industry standard was approved by the China Metallurgical Standardization Research Institute and on 10 January 2017 the pens were officially announced.<ref>Template:Cite news</ref> The achievement reached the front-page news, was discussed in talk shows and celebrated on social media.<ref>Template:Cite news</ref>
InksEdit
Ballpoint pen ink is normally a paste containing around 25 to 40 percent dye. The dyes are suspended in a mixture of solvents and fatty acids.<ref name=":0">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The most common of the solvents are benzyl alcohol or phenoxyethanol, which mix with the dyes and oils to create a smooth paste that dries quickly. This type of ink is also called "oil-based ink". The fatty acids help to lubricate the ball tip while writing. Hybrid inks also contain added lubricants in the ink to provide a smoother writing experience. The drying time of the ink varies depending upon the viscosity of the ink and the diameter of the ball.
In general, the more viscous the ink, the faster it will dry, but more writing pressure needs to be applied to dispense ink. But although they are less viscous, hybrid inks have a faster drying time compared to normal ballpoint inks. Also, a larger ball dispenses more ink and thus increases drying time.
The dyes used in blue and black ballpoint pens are basic dyes based on triarylmethane and acid dyes derived from diazo compounds or phthalocyanine. Common dyes in blue (and black) ink are Prussian blue, Victoria blue, methyl violet, crystal violet, and phthalocyanine blue. The dye eosin is commonly used for red ink.
The inks are resistant to water after drying but can be defaced by certain solvents which include acetone and various alcohols.
Types of ballpoint pensEdit
Ballpoint pens are produced in both disposable and refillable models. Refills allow for the entire internal ink reservoir, including a ballpoint and socket, to be replaced. Such characteristics are usually associated with designer-type pens or those constructed of finer materials. The simplest types of ballpoint pens are disposable and have a cap to cover the tip when the pen is not in use, or a mechanism for retracting the tip,<ref name="bpp encyc"/> which varies between manufacturers but is usually a spring- or screw-mechanism.
Rollerball pens employ the same ballpoint mechanics, but with the use of water-based inks instead of oil-based inks.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Compared to oil-based ballpoints, rollerball pens are said to provide more fluid ink-flow, but the water-based inks will blot if held stationary against the writing surface. Water-based inks also remain wet longer when freshly applied and are thus prone to "smearing"—posing problems to left-handed people (or right handed people writing right-to-left script)—and "running", should the writing surface become wet.
Some ballpoint pens use a hybrid ink formulation whose viscosity is lower than that of standard ballpoint ink, but greater than rollerball ink.<ref name=":0" /> The ink dries faster than a gel pen to prevent smearing when writing. These pens are better suited for left-handed persons. Examples are the Zebra Surari, Uni-ball Jetstream and Pilot Acroball ranges.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> These pens are also labelled "extra smooth", as they offer a smoother writing experience compared to normal ballpoint pens.
Ballpoint pens with erasable ink were pioneered by the Paper Mate pen company.<ref name="Erasable"/> The ink formulas of erasable ballpoints have properties similar to rubber cement, allowing the ink to be literally rubbed clean from the writing surface before drying and eventually becoming permanent.<ref name="Erasable"/> Erasable ink is much thicker than standard ballpoint inks, requiring pressurized cartridges to facilitate inkflow—meaning they can also write upside-down. Though these pens are equipped with erasers, any eraser will suffice.<ref name="Erasable"/>
Ballpoint tips are fitted with balls whose diameter can vary from 0.28 mm to 1.6 mm. The ball diameter does not correspond to the width of the line produced by the pen. The line width depends on various factors like the type of ink and pressure applied. Some standard ball diameters are: 0.3 mm, 0.38 mm, 0.4 mm, 0.5 mm, 0.7 mm (fine), 0.8 mm, 1.0 mm (medium), 1.2 mm and 1.4 mm (broad). Pens with ball diameters as small as 0.18 mm have been made by Japanese companies, but are extremely rare.
The inexpensive, disposable Bic Cristal (also simply "Bic pen" or "Biro") is reportedly the most widely sold pen in the world.<ref name="Phaidon">Phaidon Design Classics- Volume 2, 2006 Phaidon Press Ltd. Template:ISBN</ref><ref name="Humble">Humble Masterpieces Template:Webarchive – The Museum of Modern Art New York, 8 April – 27 September 2004.</ref> It was the Bic company's first product and is still synonymous with the company name.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The Bic Cristal is part of the permanent collection at the Museum of Modern Art in New York City, acknowledged for its industrial design.<ref name="Bic Cristal in MoMA collection">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="Humble"/> Its hexagonal barrel mimics that of a wooden pencil and is transparent, showing the ink level in the reservoir. Originally a sealed streamlined cap, the modern pen cap has a small hole at the top to meet safety standards, helping to prevent suffocation if children suck it into the throat.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Multi-pens are pens that feature multiple varying colored pen refills. Sometimes ballpoint refills are combined with another non-ballpoint refill, usually a mechanical pencil. Sometimes ballpoint pens combine a ballpoint tip on one end and touchscreen stylus on the other.
Ballpoint pens are sometimes provided free by businesses, such as hotels and banks, printed with a company's name and logo. Ballpoints have also been produced to commemorate events, such as a pen commemorating the 1963 assassination of President John F. Kennedy.<ref name="bpp encyc"/> These pens, known as "advertising pens," are the same as standard ballpoint pen models, but have become valued among collectors.
Sometimes ballpoint pens are also produced as design objects. With cases made of metal or wood, they become individually styled utility objects.
Use of ballpoint pens in spaceEdit
It is generally believed that gravity is needed to coat the ball with ink. In fact most ballpoint pens on the Earth do not work when writing upside-down because the Earth's gravity pulls the ink inside the pen away from the tip of the pen. However, in the microgravity environment of space a regular ballpoint pen can still work, pointed in any direction, because the capillary forces in the ink are stronger than non present gravitational forces. The functionality of a regular ballpoint pen in space was confirmed by ESA astronaut Pedro Duque in 2003.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Technology developed by Fisher pens in the United States resulted in the production of what came to be known as the "Fisher Space Pen". Space Pens combine a more viscous ink with a pressurized ink reservoir<ref name="How ballpoints work"/> that forces the ink toward the point. Unlike a standard ballpoint's ink container, the rear end of a Space Pen's pressurized reservoir is sealed, eliminating evaporation and leakage,<ref name="How ballpoints work"/> thus allowing the pen to write upside-down, in zero-gravity environments, and allegedly underwater.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Astronauts have made use of these pens in outer space.<ref name="How ballpoints work"/>
As an art mediumEdit
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The ballpoint pen has proven to be a versatile art medium for both professional artists and amateur doodlers.<ref name="NYT"/> Low cost, availability, and portability are cited by practitioners as qualities which make this common writing tool a convenient art supply.<ref name="Oddity"/> Some artists use them within mixed-media works, while others use them solely as their medium-of-choice.<ref name="Tricks"/>
Effects not generally associated with ballpoint pens can be achieved.Template:Citation needed Traditional pen-and-ink techniques such as stippling and cross-hatching can be used to create half-tones<ref name="Mylne"/> or the illusion of form and volume.<ref name="Art of Sketching"/> For artists whose interests necessitate precision line-work, ballpoints are an obvious attraction; ballpoint pens allow for sharp lines not as effectively executed using a brush.<ref name="Japan Times"/> Finely applied, the resulting imagery has been mistaken for airbrushed artwork<ref name="Tokyo Journal"/> and photography,<ref name="Telegraph"/> causing reactions of disbelief which ballpoint artist Lennie Mace refers to as the "Wow Factor".<ref name="Japan Times"/><ref name="Tokyo Journal"/>
Famous 20th-century artists including Andy Warhol, have utilized the ballpoint pen during their careers.<ref name="Warhol BPP"/> Ballpoint pen artwork continues to attract interest in the 21st century, with many contemporary artists gaining recognition for their specific use of ballpoint pens as a medium. Korean-American artist Il Lee has been creating large-scale, abstract artwork since the late 1970s solely with ballpoint pens.<ref name="NYT"/> Since the 1980s, Lennie Mace creates imaginative, ballpoint-only artwork of varying content and complexity, applied to unconventional surfaces including wood and denim.<ref name="Gekkan"/> The artist coined terms such as "PENtings" and "Media Graffiti" to describe his varied output.<ref name="Japan Times"/> British artist James Mylne has been creating photo-realistic artwork using mostly black ballpoints, sometimes with minimal mixed-media color.<ref name="Telegraph"/>
The ballpoint pen has several limitations as an art medium. Color availability and sensitivity of ink to light are among concerns of ballpoint pen artists.<ref name="Care"/> As a tool that uses ink, marks made with a ballpoint pen can generally not be erased.<ref name="Japan Times"/> Additionally, "blobbing" ink on the drawing surface and "skipping" ink-flow require consideration when drawing with a ballpoint pen.<ref name="Tricks"/> Although the mechanics of ballpoint pens remain relatively unchanged, ink composition has evolved to solve certain problems over the years, resulting in unpredictable sensitivity to light and some extent of fading.<ref name="Care"/>
ManufacturingEdit
The common ballpoint pen is a product of mass production, with components produced separately on assembly lines.<ref name="Incredible Pen"/> Basic steps in the manufacturing process include the production of ink formulas, molding of metal and plastic components, and assembly.<ref name="bpp encyc"/> Marcel Bich (leading to Société Bic) was involved in developing the production of inexpensive ballpoint pens.<ref name="How ballpoints work"/>
Although designs and construction vary between brands, basic components of all ballpoint pens are universal.<ref name="bpp encyc"/> The making of a ballpoint pen, specially the tip, is considered a work of precision engineering.<ref>Template:Cite news</ref> Standard components of a ballpoint tip include the freely rotating "ball" itself (distributing the ink on the writing surface), a "socket" holding the ball in place, small "ink channels" that provide ink to the ball through the socket, and a self-contained "ink reservoir" supplying ink to the ball.<ref name="How ballpoints work"/> In modern disposable pens, narrow plastic tubes contain the ink, which is compelled downward to the ball by gravity.<ref name="How ballpoints work"/> Brass, steel, or tungsten carbide are used to manufacture the ball bearing-like points,<ref name="How ballpoints work"/> then housed in a brass socket.<ref name="Incredible Pen"/>
The function of these components can be observed at a larger scale in the ball-applicator of roll-on antiperspirant. The ballpoint tip delivers the ink to the writing surface while acting as a "buffer" between the ink in the reservoir and the air outside, preventing the quick-drying ink from drying inside the reservoir. Modern ballpoints are said to have a two-year shelf life, on average.<ref name="How ballpoints work"/>
A ballpoint tip that can write comfortably for a long period of time is not easy to produce, as it requires high-precision machinery and thin high-grade steel alloy plates. China, which Template:As of produces about 80 percent of the world's ballpoint pens, relied on imported ballpoint tips and metal alloys before 2017.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
StandardsEdit
The International Organization for Standardization has published standards for ball point and roller ball pens:
- ISO 12756
- 1998: Drawing and writing instruments – Ball point pens – Vocabulary<ref>{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref>
- ISO 12757-1
- 1998: Ball point pens and refills – Part 1: General use<ref>{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref>
- ISO 12757-2
- 1998: Ball point pens and refills – Part 2: Documentary use (DOC)<ref>{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref>
- ISO 14145-1
- 1998: Roller ball pens and refills – Part 1: General use<ref>{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref>
- ISO 14145-2
- 1998: Roller ball pens and refills – Part 2: Documentary use (DOC)<ref>{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref>
Guinness World RecordsEdit
- The world's largest functioning ballpoint pen was made by Acharya Makunuri Srinivasa in India. The pen measures Template:Convert long and weighs Template:Convert.<ref>Template:Cite news</ref>
- The world's most popular pen is the Bic Cristal, with the 100 billionth model sold in September, 2006. The Bic Cristal was launched in December 1950 and roughly 57 are sold per second.<ref>{{#invoke:citation/CS1|citation
|CitationClass=web }}</ref>
See alsoEdit
ReferencesEdit
External linksEdit
- Fascinating facts about the invention of the Ballpoint Pen by Ladislas Biro in 1935 (archived 13 September 2019)
- Laszlo Biro on Jewish.hu's list of famous Hungarians (archived 22 May 2013)