TAKANO, M. A Modified Subformula Property for the Modal Logic S4.2. Bulletin of the Section of Logic, [S. l.], v. 48, n. 1, p. 19–28, 2019. DOI: 10.18778/0138-0680.48.1.02. Disponível em: https://czasopisma.uni.lodz.pl/bulletin/article/view/5382. Acesso em: 2 may. 2024.