TKACZYK, M. Negation in weak positional calculi. Logic and Logical Philosophy, [S. l.], v. 22, n. 1, p. 3–19, 2013. DOI: 10.12775/LLP.2013.001. Disponível em: https://apcz.umk.pl/LLP/article/view/LLP.2013.001. Acesso em: 21 feb. 2024.