SONER, N. D.; CHALUVARAJU, B.; JANAKIRAM, B. The Double Global Domination Number of a Graph. The Journal of the Indian Mathematical Society, [S. l.], v. 70, n. 1-4, p. 191–195, 2003. Disponível em: https://informaticsjournals.co.in/index.php/jims/article/view/21949. Acesso em: 8 nov. 2024.