Mutua, Amos Kituku, Lewis Namu Nyaga, and Richard Kiriuki Gachimu. “Combinatorial Properties, Invariants and Structures of the Action of Sn×An on X×Y”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 40, no. 2 (August 11, 2018): 109–115. Accessed April 28, 2024. https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/9114.