M, Parimala, and Udhayakumar Ramalingam. “SG_C-Projective, Injective and Flat Modules”. Journal of the Indonesian Mathematical Society 25, no. 2 (July 10, 2019): 108–120. Accessed March 31, 2025. http://jims-a.org/index.php/jimsa/article/view/754.