SHEIKHOLESLAMI, S. M.; VOLKMANN, L. Twin signed Roman domatic numbers in digraphs. Tamkang Journal of Mathematics, [S. l.], v. 48, n. 3, p. 265-272, 2017. DOI: 10.5556/j.tkjm.48.2017.2306. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/2306. Acesso em: 24 may. 2022.