ODINTSOV, S. P.; SKURT, D.; WANSING, H. On Definability of Connectives and Modal Logics over FDE. Logic and Logical Philosophy, [S. l.], v. 28, n. 4, p. 631–659, 2019. DOI: 10.12775/LLP.2019.010. Disponível em: https://apcz.umk.pl/LLP/article/view/LLP.2019.010. Acesso em: 25 oct. 2021.