Metsch, Klaus. “The Chromatic Number of Two Families of Generalized Kneser Graphs Related to Finite Generalized Quadrangles and Finite Projective 3-Spaces”. The Electronic Journal of Combinatorics 28, no. 3 (July 2, 2021): P3.2. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v28i3p2.