Anstee RP, Karp SN. Forbidden Configurations: Exact Bounds Determined by Critical Substructures. Electron. J. Combin. [Internet]. 2010Mar.29 [cited 2026Jun.1];17(1):#R50. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v17i1r50