He, Yuhang, Zhiheng Ma, Xing Wei, Xiaopeng Hong, Wei Ke, and Yihong Gong. 2021. “Error-Aware Density Isomorphism Reconstruction for Unsupervised Cross-Domain Crowd Counting”. Proceedings of the AAAI Conference on Artificial Intelligence 35 (2):1540-48. https://ojs.aaai.org/index.php/AAAI/article/view/16245.