Bending, T. D., and D. Fon-Der-Flaass. “Crooked Functions, Bent Functions, and Distance Regular Graphs”. The Electronic Journal of Combinatorics 5, no. 1 (June 30, 1998): R34. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v5i1r34.