M. P. Aparna, and R. Akhila. “Principal Topology on a Rees Matrix Semigroup Using Green’s Left Quasiorder”. International Journal of Mathematics And its Applications 8, no. 3 (September 15, 2020): 51–57. Accessed May 17, 2024. http://ijmaa.in/index.php/ijmaa/article/view/128.