Lu, Yu, Yang Pian, Penghe Chen, Qinggang Meng, and Yunbo Cao. “RadarMath: An Intelligent Tutoring System for Math Education”. Proceedings of the AAAI Conference on Artificial Intelligence 35, no. 18 (May 18, 2021): 16087-16090. Accessed September 21, 2021. https://ojs.aaai.org/index.php/AAAI/article/view/18020.