@InProceedings{fei-liu:2015:EMNLP,
  author    = {Fei, Geli  and  Liu, Bing},
  title     = {Social Media Text Classification under Negative Covariate Shift},
  booktitle = {Proceedings of the 2015 Conference on Empirical Methods in Natural Language Processing},
  month     = {September},
  year      = {2015},
  address   = {Lisbon, Portugal},
  publisher = {Association for Computational Linguistics},
  pages     = {2347--2356},
  url       = {http://aclweb.org/anthology/D15-1282}
}