YERO, ISMAEL GONZALEZ; RODRIGUEZ-VELAZQUEZ, JUAN A. A survey on alliances in graphs: Defensive alliances. Utilitas Mathematica , [S. l.], v. 105, 2017. Disponível em: https://utilitasmathematica.com/index.php/Index/article/view/1170. Acesso em: 1 may. 2026.