WIŚNIEWSKI, A. Propositions, possible worlds, and recursion. Logic and Logical Philosophy, [S. l.], v. 20, n. 1-2, p. 73–79, 2011. DOI: 10.12775/LLP.2011.004. Disponível em: https://apcz.umk.pl/LLP/article/view/LLP.2011.004. Acesso em: 25 jul. 2024.