@inproceedings{Matsuzaki-etAl:2003:CONLL,
  author = {Matsuzaki, Takuya  and  Miyao, Yusuke  and  Tsujii, Jun'ichi},
  title  = {An efficient clustering algorithm for class-based language models},
  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/W03-0416.pdf},
  year   = 2003,
  pages  = {119--126}