Zhai, Zhongwu, Bing Liu, Lei Zhang, Hua Xu, and Peifa Jia. “Identifying Evaluative Sentences in Online Discussions”. Proceedings of the AAAI Conference on Artificial Intelligence 25, no. 1 (August 4, 2011): 933–938. Accessed May 7, 2026. https://ojs.aaai.org/index.php/AAAI/article/view/7966.