Editing Absolute geometry (section)

==References==
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* {{citation
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 | edition = 2nd
 | isbn = 9783110740783
 | publisher = Walter de Gruyter
 | series = De Gruyter Textbooks
 | title = Geometry and Discrete Mathematics: A Selection of Highlights
 | year = 2022}}
* {{citation|authorlink=Marvin Greenberg|last=Greenberg|first=Marvin Jay|title=Euclidean and Non-Euclidean Geometries: Development and History|edition=4th|place=New York|publisher=W. H. Freeman|year=2007|isbn=0-7167-9948-0}}
* {{citation|authorlink=Marvin Greenberg|last=Greenberg|first=Marvin Jay|title=Old and New Results in the Foundations of Elementary Plane Euclidean and Non-Euclidean Geometries|journal=Mathematical Association of America Monthly|volume=117|year=2010|pages=198–219|url=https://www.maa.org/sites/default/files/images/upload_library/22/Ford/Greenberg2011.pdf}}
* {{citation|first=Robin|last=Hartshorne|author-link= Robin Hartshorne|title=Geometry: Euclid and Beyond|place= New York| publisher=Springer-Verlag|year= 2005|isbn=0-387-98650-2}}
* Pambuccain, Victor ''Axiomatizations of hyperbolic and absolute geometries'', in: ''Non-Euclidean geometries'' (A. Prékopa and E. Molnár, eds.). János Bolyai memorial volume. Papers from the international conference on hyperbolic geometry, Budapest, Hungary, July 6–12, 2002. New York, NY: Springer, 119–153, 2006.