Li, Kai, and Dong Hao. “Cooperation Enforcement and Collusion Resistance in Repeated Public Goods Games”. Proceedings of the AAAI Conference on Artificial Intelligence 33, no. 01 (July 17, 2019): 2085-2092. Accessed June 24, 2022. https://ojs.aaai.org/index.php/AAAI/article/view/4039.