MÉTIVIER, Y.; SOPENA, E. Graph Relabelling Systems: A General Overview. Computing and Informatics, [S. l.], v. 16, n. 2, p. 167–185, 2012. Disponível em: https://www.cai.sk/ojs/index.php/cai/article/view/667. Acesso em: 23 jan. 2025.