BibTeX: 
@article{Foundation_of_geometryAFP,
author = {Fumiya Iwama},
title = {Foundation of geometry in planes, and some complements: Excluding the parallel axioms},
journal = {Archive of Formal Proofs},
month = nov,
year = 2021,
note = {\url{https://isaafp.org/entries/Foundation_of_geometry.html},
Formal proof development},
ISSN = {2150914x},
}
