@inproceedings{Tsuruoka-Tsujii:2003:CONLL,
  author = {Tsuruoka, Yoshimasa  and  Tsujii, Jun'ichi},
  title  = {Training a Naive Bayes Classifier via the EM Algorithm with a Class Distribution Constraint},
  booktitle = {Proceedings of the Seventh Conference on Natural Language Learning at HLT-NAACL 2003},
  editor = {Walter Daelemans and Miles Osborne},
  url    = {http://www.aclweb.org/anthology/W03-0417.pdf},
  year   = 2003,
  pages  = {127--134}