R. SURESHKUMAR; S. MURUGESAN. Centered Polygonal Sum Labeling of Graphs. International Journal of Mathematics And its Applications, [S. l.], v. 6, n. 3, p. 137–144, 2018. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/364. Acesso em: 8 may. 2024.