SHEIKHOLESLAMI, S. M.; DEHGARDI, N.; VOLKMANN, L.; MEIERLING, D. The Roman bondage number of a digraph. Tamkang Journal of Mathematics, [S. l.], v. 47, n. 4, p. 421-431, 2016. DOI: 10.5556/j.tkjm.47.2016.2100. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/2100. Acesso em: 24 may. 2022.