Christofides, Demetres, and Klas Markström. “The Guessing Number of Undirected Graphs”. The Electronic Journal of Combinatorics 18, no. 1 (September 26, 2011): P192. Accessed April 1, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v18i1p192.