B Sooryanarayana, and Sunita Priya D Silva. “Mod Difference Labeling of Some Classes of Digraphs”. Malaya Journal of Matematik 8, no. 01 (January 1, 2020): 32–36. Accessed November 24, 2024. https://www.malayajournal.org/index.php/mjm/article/view/1318.