Akbari, Saieed, Vahid Liaghat, and Afshin Nikzad. “Colorful Paths in Vertex Coloring of Graphs”. The Electronic Journal of Combinatorics 18, no. 1 (January 12, 2011): #P17. Accessed May 3, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v18i1p17.