MAX, I. Existence, the square of opposites, and two-dimensional logic. Logic and Logical Philosophy, [S. l.], n. 2, p. 135–149, 2003. DOI: 10.12775/LLP.1994.009. Disponível em: https://apcz.umk.pl/LLP/article/view/LLP.1994.009. Acesso em: 28 mar. 2024.