Editing Bra–ket notation (section)

== References ==
* {{cite journal |last=Dirac |first=P. A. M. |year=1939 |title=A new notation for quantum mechanics |journal=[[Mathematical Proceedings of the Cambridge Philosophical Society]] |volume=35 |issue=3 |pages=416–418 |doi=10.1017/S0305004100021162 |bibcode=1939PCPS...35..416D |s2cid=121466183}} Also see his standard text, ''The Principles of Quantum Mechanics'', IV edition, Clarendon Press (1958), {{isbn|978-0198520115}} 
* {{cite book |last=Grassmann |first=H. |year=1862 |title=Extension Theory |series=History of Mathematics Sources |publisher=American Mathematical Society, London Mathematical Society |others=2000 translation by Lloyd C. Kannenberg}}
* {{cite book |last=Cajori |first=Florian |author-link=Florian Cajori |title=A History Of Mathematical Notations Volume II |year=1929 |publisher=[[Open Court Publishing Company|Open Court Publishing]] |url=https://archive.org/details/historyofmathema00cajo_0/page/134 |isbn=978-0-486-67766-8 |page=[https://archive.org/details/historyofmathema00cajo_0/page/134 134]}}
* {{cite book |last=Shankar |first=R. |year=1994 |title=Principles of Quantum Mechanics |edition=2nd |isbn=0-306-44790-8}}
* {{cite book |last1=Feynman |first1=Richard P. |last2=Leighton |first2=Robert B. |last3=Sands |first3=Matthew |year=1965 |title=The Feynman Lectures on Physics |volume=III |location=Reading, MA |publisher=Addison-Wesley |isbn=0-201-02118-8 |url=https://feynmanlectures.caltech.edu/III_toc.html}}
*{{cite book |last1=Sakurai |first1=J J |last2=Napolitano |first2=J |title=[[Modern Quantum Mechanics]] |edition=3rd |date=2021 |publisher=Cambridge University Press |isbn=978-1-108-42241-3}}