Liu, Zhenjun, Leroy Chew, and Marijn J. H. Heule. “Avoiding Monochromatic Rectangles Using Shift Patterns”. Proceedings of the International Symposium on Combinatorial Search 12, no. 1 (July 21, 2021): 225–227. Accessed May 8, 2026. https://ojs.aaai.org/index.php/SOCS/article/view/18591.