JAISON JOSE; V. SANGEETHA. On Proper 2-rainbow Domination in Graphs. International Journal of Mathematics And its Applications, [S. l.], v. 6, n. 1 - C, p. 429–434, 2018. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/1086. Acesso em: 17 dec. 2025.