PAAD, A. Tense Operators on BL-algebras and Their Applications. Bulletin of the Section of Logic, [S. l.], v. 50, n. 3, p. 299–324, 2021. DOI: 10.18778/0138-0680.2021.11. Disponível em: https://czasopisma.uni.lodz.pl/bulletin/article/view/5962. Acesso em: 6 may. 2024.