KANAKAMBIKA, K.; THAMIZHENDHI, G. Some operations on congruence labeled graphs. Serdica Mathematical Journal, Sofia, Bulgaria, v. 52, n. 1, p. 17–28, 2026. DOI: 10.55630/serdica.2026.52.17-28. Disponível em: https://serdica.math.bas.bg/index.php/serdica/article/view/98. Acesso em: 10 jun. 2026.