@InProceedings{chang-ratinov-roth:2007:ACLMain,
  author    = {Chang, Ming-Wei  and  Ratinov, Lev  and  Roth, Dan},
  title     = {Guiding Semi-Supervision with Constraint-Driven Learning},
  booktitle = {Proceedings of the 45th Annual Meeting of the Association of Computational Linguistics},
  month     = {June},
  year      = {2007},
  address   = {Prague, Czech Republic},
  publisher = {Association for Computational Linguistics},
  pages     = {280--287},
  url       = {http://www.aclweb.org/anthology/P/P07/P07-0036}
}