DROBYSHEVICH, Sergey. On Displaying Negative Modalities. Logic and Logical Philosophy, [S. l.], v. 27, n. 2, p. 161–192, 2017. DOI: 10.12775/LLP.2017.023. Disponível em: https://apcz.umk.pl/LLP/article/view/LLP.2017.023. Acesso em: 8 jul. 2025.