Phan The Hai, Truong Cong Quynh, and Le Thi Thanh. “ MODULES INVARIANT UNDER IDEMPOTENT HOMOMORPHISMS”. UED Journal of Social Sciences, Humanities and Education 7, no. 1 (March 28, 2017): 9-15. Accessed May 20, 2024. https://jshe.vn/index.php/jshe/article/view/740.