RESTALL, G. First Degree Entailment, Symmetry and Paradox. Logic and Logical Philosophy, [S. l.], v. 26, n. 1, p. 3–18, 2016. DOI: 10.12775/LLP.2016.028. Disponível em: https://apcz.umk.pl/LLP/article/view/LLP.2016.028. Acesso em: 4 jul. 2024.