Choban, Mitrofan, and Ion Valuţă. “On the Monoid of Endomorphisms of a Topological Universal Algebra”. Acta et Commentationes Exact and Natural Sciences 10, no. 2 (January 12, 2021): 47-53. Accessed September 8, 2026. https://revistaust.upsc.md/index.php/acta_exacte/article/view/595.