NOWAK, M. A Syntactic Approach to Closure Operation. Bulletin of the Section of Logic, [S. l.], v. 46, n. 3/4, p. 219–232, 2017. DOI: 10.18778/0138-0680.46.3.4.04. Disponível em: https://czasopisma.uni.lodz.pl/bulletin/article/view/3256. Acesso em: 27 apr. 2024.