@Book{SSLNLP:2009,
  editor    = {Qin Iris Wang  and  Kevin Duh  and  Dekang Lin},
  title     = {Proceedings of the NAACL HLT 2009 Workshop on Semi-supervised Learning for Natural Language Processing},
  month     = {June},
  year      = {2009},
  address   = {Boulder, Colorado},
  publisher = {Association for Computational Linguistics},
  url       = {http://www.aclweb.org/anthology/W09-22}
}