Arévalo, Alma R., Amanda Montejano, and Edgardo Roldán-Pensado. “Zero-Sum Squares in Bounded Discrepancy $\{-1,1\}$-Matrices”. The Electronic Journal of Combinatorics 28, no. 4 (October 22, 2021): P4.15. Accessed March 29, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v28i4p15.