Hajiabolhassan, Hossein, and Ali Taherkhani. “Graph Powers and Graph Homomorphisms”. The Electronic Journal of Combinatorics 17, no. 1 (January 22, 2010): R17. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v17i1r17.