JARMUŻEK, Tomasz; PIETRUSZCZAK, Andrzej. Completeness of Minimal Positional Calculus. Logic and Logical Philosophy, [S. l.], v. 13, n. 13, p. 147–162, 2004. DOI: 10.12775/LLP.2004.009. Disponível em: https://apcz.umk.pl/LLP/article/view/LLP.2004.009. Acesso em: 8 jan. 2026.