Chaturvedi, A.K., S. Kumar, S. Prakash, and N. Kumar. “Essentially Iso-Retractable Modules and Rings”. Carpathian Mathematical Publications 14, no. 1 (April 27, 2022): 76–85. Accessed November 22, 2024. https://vps.pnu.edu.ua/index.php/cmp/article/view/5200.