Britz, Thomas, Nicholas J. Cavenagh, Adam Mammoliti, and Ian M. Wanless. “Mutually Orthogonal Binary Frequency Squares”. The Electronic Journal of Combinatorics 27, no. 3 (July 10, 2020): #P3.7. Accessed May 25, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v27i3p7.