Loubere IMagic Squares Semigroups and Groups. Global Journal of Science Frontier Research, [S. l.], v. 15, n. F1, p. 61–70, 2015. Disponível em: https://www.journalofscience.org/index.php/GJSFR/article/view/1530. Acesso em: 14 aug. 2026.