Seoud, M. A.-A. ., E. M. . Roshdy, and M. S. . AboShady. “On Strongly *-Graphs: On Strongly *-Graphs”. Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, vol. 54, no. 2, Apr. 2021, pp. 179–195, https://ppaspk.org/index.php/PPAS-A/article/view/248.