BATENS, Diderik. Propositional logic extended with a pedagogically useful relevant implication. Logic and Logical Philosophy, [S. l.], v. 23, n. 3, p. 245–276, 2013. DOI: 10.12775/LLP.2013.024. Disponível em: https://apcz.umk.pl/LLP/article/view/LLP.2013.024. Acesso em: 5 feb. 2025.