MUTUA, A. K.; NYAGA, L. N.; GACHIMU, R. K. Combinatorial Properties, Invariants and Structures of the Action of Sn×An on X×Y. International Journal of Sciences: Basic and Applied Research (IJSBAR), [S. l.], v. 40, n. 2, p. 109–115, 2018. Disponível em: https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/9114. Acesso em: 29 apr. 2024.