COCKAYNE E.J.; GROBLER P.J.P.; GRUNDLINGH W.R.; MUNGANGA J.; VAN VUUREN J.H. Protection of a Graph. Utilitas Mathematica , [S. l.], v. 67, 2005. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/370. Acesso em: 25 aug. 2026.