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Dedhert.Jr (bicara | kontrib) →Referensi: div col |
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|doi = 10.2307/2939504}}
*{{cite book
|last = Gerla
|first = G |year = 1995
|contribution-url =
|contribution = Pointless Geometries
|editor1-last = Buekenhout
|editor1-first = F. |editor2-last = Kantor
|editor2-first = W |title = Handbook of Incidence Geometry: Buildings and Foundations
|publisher = North-Holland
|page = 1015–1031.
|access-date = 2023-02-26
|archive-date = 2011-07-17
|archive-url = https://web.archive.org/web/20110717210751/http://www.dmi.unisa.it/people/gerla/www/Down/point-free.pdf
|dead-url = yes
}}
*{{cite book
|last = Heath |first = Thomas L.
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