Chi, Cheng, Shifeng Zhang, Junliang Xing, Zhen Lei, Stan Z. Li, and Xudong Zou. “Relational Learning for Joint Head and Human Detection”. Proceedings of the AAAI Conference on Artificial Intelligence 34, no. 07 (April 3, 2020): 10647-10654. Accessed October 26, 2021. https://ojs.aaai.org/index.php/AAAI/article/view/6691.