CITKIN, A. A meta-logic of inference rules: Syntax. Logic and Logical Philosophy, [S. l.], v. 24, n. 3, p. 313–337, 2015. DOI: 10.12775/LLP.2015.007. Disponível em: https://apcz.umk.pl/LLP/article/view/LLP.2015.007. Acesso em: 16 aug. 2024.