Zhang, Hao, Shuigeng Zhou, Chuanxu Yan, Jihong Guan, and Xin Wang. “Recursively Learning Causal Structures Using Regression-Based Conditional Independence Test”. Proceedings of the AAAI Conference on Artificial Intelligence 33, no. 01 (July 17, 2019): 3108-3115. Accessed June 25, 2022. https://ojs.aaai.org/index.php/AAAI/article/view/4170.