Adaricheva, Kira, and J. B. Nation. “A Class of Infinite Convex Geometries”. The Electronic Journal of Combinatorics 23, no. 1 (March 18, 2016): #P1.56. Accessed April 20, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v23i1p56.