Yusuf, Anas, and Ejima Ojonugwa. “SOME PROPERTIES OF AN EXTENDED r_1-NON DERANGED PERMUTATION GROUP”. FUDMA JOURNAL OF SCIENCES 7, no. 3 (November 13, 2023): 332 - 336. Accessed May 20, 2024. https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/2031.