JÓNSSON, Bjarni. Modular lattices and Desargues’ theorem. MATHEMATICA SCANDINAVICA, [S. l.], v. 2, p. 294–313, 1954. DOI: 10.7146/math.scand.a-10416. Disponível em: https://tidsskrift.dk/math/article/view/10416. Acesso em: 13 aug. 2026.