Гаврилків, Володимир Михайлович. “MONOTONE FAMILIES ON CYCLIC SEMIGROUPS”. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number, no. 1(17) (March 7, 2019): 102–112. Accessed April 10, 2025. https://pvntsh.nung.edu.ua/index.php/number/article/view/236.