JAFARI RAD, NADER; HANSBERG, ADRIANA; VOLKMANN, LUTZ. Vertex and edge critical Roman domination in graphs. Utilitas Mathematica , [S. l.], v. 90, 2013. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/1001. Acesso em: 8 may. 2026.