MUTUA, Amos Kituku; NYAGA, Lewis Namu; GACHIMU, Richard Kiriuki. Combinatorial Properties, Invariants and Structures of the Action of Sn×An on X×Y. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 40, n. 2, p. 109–115, 2018. Disponível em: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/9114. Acesso em: 13 sep. 2025.