V. J. Kaneria, and H. P. Chudasama. “Graceful Labeling in the Context of Duplication of Some Graph Elements in $\bf K_{m,n}$”. International Journal of Mathematics And Its Applications, vol. 5, no. 3 - A, July 2017, pp. 53-55, https://ijmaa.in/index.php/ijmaa/article/view/847.