@InProceedings{chen-ma-liu:2015:ACL-IJCNLP,
  author    = {Chen, Zhiyuan  and  Ma, Nianzu  and  Liu, Bing},
  title     = {Lifelong Learning for Sentiment Classification},
  booktitle = {Proceedings of the 53rd Annual Meeting of the Association for Computational Linguistics and the 7th International Joint Conference on Natural Language Processing (Volume 2: Short Papers)},
  month     = {July},
  year      = {2015},
  address   = {Beijing, China},
  publisher = {Association for Computational Linguistics},
  pages     = {750--756},
  url       = {http://www.aclweb.org/anthology/P15-2123}
}