Liu, Tao, Xiaoyong Du, Yongdong Xu, Minghui Li, and Xiaolong Wang. “Partially Supervised Text Classification With Multi-Level Examples”. Proceedings of the AAAI Conference on Artificial Intelligence 25, no. 1 (August 4, 2011): 890–895. Accessed May 7, 2026. https://ojs.aaai.org/index.php/AAAI/article/view/7969.