@InProceedings{shen-li:2011:EMNLP,
  author    = {Shen, Chao  and  Li, Tao},
  title     = {A Non-negative Matrix Factorization Based Approach for Active Dual Supervision from Document and Word Labels},
  booktitle = {Proceedings of the 2011 Conference on Empirical Methods in Natural Language Processing},
  month     = {July},
  year      = {2011},
  address   = {Edinburgh, Scotland, UK.},
  publisher = {Association for Computational Linguistics},
  pages     = {949--958},
  url       = {http://www.aclweb.org/anthology/D11-1088}
}