Kempner, Yulia, and Vadim E. Levit. “Correspondence Between Two Antimatroid Algorithmic Characterizations”. The Electronic Journal of Combinatorics 10, no. 1 (November 17, 2003): #R44. Accessed May 30, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v10i1r44.