1.
E. M. Elkholy, A. Sakr, H. Ahmed. Folding of Digraphs. Int. J. Math. And Appl. [Internet]. 2015 Nov. 15 [cited 2024 May 12];3(3 - D):13-7. Available from: http://ijmaa.in/index.php/ijmaa/article/view/471