Simonyan, I. R. “LATICES OF DISTRIBUTIVE AND HYPERDISTRIBUTIVE VARIETIES OF SEMIGROUPS”. Proceedings of the YSU A: Physical and Mathematical Sciences 38, no. 2 (204) (April 30, 2004): 7–19. Accessed November 23, 2024. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol38_no2_2004_pp007-019.