Krul, Michael, and Luboš Thoma. “2-Colorability of R-Uniform Hypergraphs”. The Electronic Journal of Combinatorics 26, no. 3 (August 16, 2019): P3.30. Accessed March 28, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v26i3p30.