Khaiarallha Al’Dzhabri, K. S., Hamza, A.-H. M. and Eissa, Y. S. (2020) “On DG- Topological operators Associated with Digraphs”, Journal of Al-Qadisiyah for Computer Science and Mathematics, 12(1), pp. Math Page 60 – 71. doi: 10.29304/jqcm.2020.12.1.668.