WITCZAK, T. Topological and Multi-Topological Frames in the Context of Intuitionistic Modal Logic. Bulletin of the Section of Logic, [S. l.], v. 48, n. 3, p. 187–205, 2019. DOI: 10.18778/0138-0680.48.3.03. Disponível em: https://czasopisma.uni.lodz.pl/bulletin/article/view/6205. Acesso em: 14 aug. 2022.