Sheikholeslami SM, Dehgardi N, Volkmann L, Meierling D. The Roman bondage number of a digraph. Tamkang J. Math. [Internet]. 2016 Dec. 30 [cited 2024 Apr. 19];47(4):421-3. Available from: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/2100