Meera Meghpara, H. M. Karavadiya, and V. J. Kaneria. “A Study on $\alpha-$graceful Labeling of Spade Graph”. International Journal of Mathematics And its Applications 9, no. 1 (March 15, 2021): 113–117. Accessed May 5, 2024. http://ijmaa.in/index.php/ijmaa/article/view/108.