K. Kasthuri, K. Karuppasamy, and K. Nagarajan. “PD-Divisor Cordial Labeling of Graphs”. International Journal of Mathematics And its Applications 10, no. 4 (December 15, 2022): 9–15. Accessed May 7, 2024. http://ijmaa.in/index.php/ijmaa/article/view/689.