Ishii, Kazuaki. “Orthogonal Arrays With Parameters $OA(s^3,s^2+s+1,s,2)$ and 3-Dimensional Projective Geometries”. The Electronic Journal of Combinatorics 18, no. 1 (March 31, 2011): P69. Accessed March 17, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v18i1p69.