Qian, Hangwei, Sinno Jialin Pan, and Chunyan Miao. “Distribution-Based Semi-Supervised Learning for Activity Recognition”. Proceedings of the AAAI Conference on Artificial Intelligence 33, no. 01 (July 17, 2019): 7699-7706. Accessed September 26, 2021. https://ojs.aaai.org/index.php/AAAI/article/view/4765.