T. Rastad and N. Delfan, “THE RELATION BETWEEN TOPOLOGICAL ORDERING AND ADJACENCY MATRIX IN DIGRAPHS”, Int. J. Math. Model. Comput., vol. 2, no. 1, pp. 71–75, Dec. 2012, Accessed: May 09, 2026. [Online]. Available: http://oiccpress.com/ijm2c/article/view/11145