Reserved Self-training: A Semi-supervised Sentiment Classification Method for Chinese Microblogs Zhiguang Liu author Xishuang Dong author Yi Guan author Jinfeng Yang author 2013-10 text Proceedings of the Sixth International Joint Conference on Natural Language Processing Ruslan Mitkov editor Jong C Park editor Asian Federation of Natural Language Processing Nagoya, Japan conference publication liu-etal-2013-reserved https://aclanthology.org/I13-1052/ 2013-10 455 462