LUTSAK, S. M. The complexity of quasivariety lattices for the classes of differential groupoids. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 93, n. 1, p. 32–45, 2018. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/432. Acesso em: 22 jul. 2024.