Alderson, Tim, and Simeon Ball. “On Sets of Subspaces With Restricted Hyperplane Intersection Numbers”. The Electronic Journal of Combinatorics 33, no. 3 (September 25, 2026): #P3.84. Accessed September 25, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v33i3p84.