Ravsky, A.V., and T.O. Banakh. “ On Pseudobounded and Premeage Paratopological Groups”.
Matematychni Studii
56, no. 1 (October 27, 2021): 20-27. Accessed July 25, 2025. http://www.matstud.org.ua/ojs/index.php/matstud/article/view/261.