SAYADYAN, S. M. .; CHUBARYAN, A. A. . On Polynomially Equivalence of Minimal Frege Systems. Mathematical Problems of Computer Science, [S. l.], v. 28, p. 141–145, 2021. Disponível em: http://mpcs.sci.am/index.php/mpcs/article/view/512. Acesso em: 5 may. 2024.