KHAMISYAN, A. A. . On Some Universal Propositional Proof Systems for Many-Valued Logic. Mathematical Problems of Computer Science, [S. l.], v. 53, p. 21–28, 2020. DOI: 10.51408/1963-0049. Disponível em: http://mpcs.sci.am/index.php/mpcs/article/view/12. Acesso em: 2 may. 2024.