Team, S. (2003) “Characterization of Digraphs of Right (Left) Zero Unions of Groups: Sr. Arworn, U. Knauer, N. Na Chiangmai”, Thai Journal of Mathematics, 1(1), pp. 131–140. Available at: https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/15 (Accessed: 2 May 2024).