Ndubuisi, Ugochukwu, Asibong-Ibe U.I, and Udoaka O.G. “Congruences on *-Simple Type A I-Semigroups”. JOURNAL OF ADVANCES IN MATHEMATICS 16 (January 31, 2019): 8199–8207. Accessed November 21, 2024. https://rajpub.com/index.php/jam/article/view/7980.