SILVESTRE, Ricardo Sousa. Paranormal modal logic – Part II: K?, K and Classical Logic and other paranormal modal systems. Logic and Logical Philosophy, [S. l.], v. 22, n. 1, p. 89–130, 2013. DOI: 10.12775/LLP.2013.006. Disponível em: https://apcz.umk.pl/LLP/article/view/LLP.2013.006. Acesso em: 8 jul. 2025.