HAMBARDZUMYAN, A. A. Investigation of Monotonous Properties for Frege Systems. Mathematical Problems of Computer Science, [S. l.], v. 53, p. 14–20, 2020. DOI: 10.51408/1963-0048. Disponível em: http://mpcs.sci.am/index.php/mpcs/article/view/11. Acesso em: 28 apr. 2024.