Csikvári, Péter. “Applications of the Kelmans Transformation: Extremality of the Threshold Graphs”. The Electronic Journal of Combinatorics 18, no. 1 (September 20, 2011): P182. Accessed March 17, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v18i1p182.