FIRUZKUHY, A.; DOOSTIE, H. Commuting Regular Graphs for Non-commutative Semigroups. Communications in Mathematics and Applications, [S. l.], v. 7, n. 2, p. 115–119, 2016. DOI: 10.26713/cma.v7i2.371. Disponível em: https://www.rgnpublications.com/journals/index.php/cma/article/view/371. Acesso em: 3 may. 2024.