Elakkiya, A., and M. Yamuna. “Planar and Non Planar Construction of ï§- Uniquely Colorable Graph”. International Journal of Engineering and Technology 7, no. 4.10 (October 2, 2018): 998–1000. Accessed April 15, 2025. https://sciencepubco.com/index.php/IJET/article/view/26656.