Sundberg, Eric Lars. “Extremal Hypergraphs for the Biased Erdős-Selfridge Theorem”. The Electronic Journal of Combinatorics 20, no. 1 (February 5, 2013): P26. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v20i1p26.