Ebert, Gary, Giuseppe Marino, Olga Polverino, and Rocco Trombetti. “Semifields in Class ${\cal F}_4^{(a)}$”. The Electronic Journal of Combinatorics 16, no. 1 (April 30, 2009): R53. Accessed March 16, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v16i1r53.