@InProceedings{mann-mccallum:2007:ShortPapers,
  author    = {Mann, Gideon  and  McCallum, Andrew},
  title     = {Efficient Computation of Entropy Gradient for Semi-Supervised Conditional Random Fields},
  booktitle = {Human Language Technologies 2007: The Conference of the North American Chapter of the Association for Computational Linguistics; Companion Volume, Short Papers},
  month     = {April},
  year      = {2007},
  address   = {Rochester, New York},
  publisher = {Association for Computational Linguistics},
  pages     = {109--112},
  url       = {http://www.aclweb.org/anthology/N/N07/N07-2028}
}