Morgan, Kerri, and Graham Farr. “Certificates of Factorisation for a Class of Triangle-Free Graphs”. The Electronic Journal of Combinatorics 16, no. 1 (June 19, 2009): R75. Accessed March 16, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v16i1r75.