BOTNARU, Dumitru, and T¸URCANUAlina. “SOME PROPERTIES OF LEFT PRODUCT OF TWO SUBCATEGORIES”. Acta et Commentationes Exact and Natural Sciences 4, no. 2 (July 9, 2019): 35-44. Accessed December 1, 2021. https://revista.ust.md/index.php/acta_exacte/article/view/350.