A. M, Babayo. Isomorphism Theorems of Triple Direct Product Convergent Semigroup of Geometric Progression. International Journal of Formal Sciences: Current and Future Research Trends, Jordan, v. 7, n. 01, p. 1–6, 2020. Disponível em: https://ijfscfrtjournal.isrra.org/Formal_Sciences_Journal/article/view/558. Acesso em: 16 dec. 2025.