A. K. Mutua, L. N. Nyaga, and R. K. Gachimu, “Combinatorial Properties, Invariants and Structures of the Action of Sn×An on X×Y”, IJSBAR, vol. 40, no. 2, pp. 109–115, Aug. 2018, Accessed: Oct. 07, 2025. [Online]. Available: https://gssrr.org/JournalOfBasicAndApplied/article/view/9114