Truong Cong Quynh, and Truong Tri Dung. “ON IDEMPOTENT - SEMIPRIME RINGS”. UED Journal of Social Sciences, Humanities and Education 7, no. 5 (December 30, 2017): 1-4. Accessed November 24, 2024. https://jshe.vn/index.php/jshe/article/view/819.