1.
Sheikholeslami SM, Bodaghli A, Volkmann L. Twin signed Roman domination numbers in directed graphs. Tamkang J. Math. [Internet]. 2016Sep.30 [cited 2022Jan.18];47(3):357-71. Available from: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/2035