[1]
V. D. Derech, “Congruences of a Permutable Inverse Semigroup of Finite Rank”, Ukr. Mat. Zhurn., vol. 57, no. 4, pp. 469–473, Apr. 2005, Accessed: Apr. 23, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3613