Sk Amanathulla, Biswajit Bera, and Madhumangal Pal. 2021. “\text { Surjective } L(3,1) \text {-Labeling of Circular-Arc Graphs }”. Malaya Journal of Matematik 9 (01). India:925-29. https://www.malayajournal.org/index.php/mjm/article/view/1198.