Cooper, Martin, and Guillaume Escamocher. “A Dichotomy for 2-Constraint Forbidden CSP Patterns”. Proceedings of the AAAI Conference on Artificial Intelligence 26, no. 1 (September 20, 2021): 464–470. Accessed May 10, 2026. https://ojs.aaai.org/index.php/AAAI/article/view/8131.