Samir K. Vaidya, and Minal S. Shukla. “Switching of a Vertex in Path and $b$-Coloring”. International Journal of Mathematics And its Applications 3, no. 3 - A (September 15, 2015): 85–91. Accessed May 19, 2024. http://ijmaa.in/index.php/ijmaa/article/view/449.