K. KASTHURI; K. KARUPPASAMY; K. NAGARAJAN. PD-Divisor Cordial Labeling of Graphs. International Journal of Mathematics And its Applications, [S. l.], v. 10, n. 4, p. 9–15, 2022. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/689. Acesso em: 7 may. 2024.