Etzion, Tuvi, and Niv Hooker. “Residual $q$-Fano Planes and Related Structures”. The Electronic Journal of Combinatorics 25, no. 2 (April 3, 2018): P2.3. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v25i2p3.