@InProceedings{chen-zechner-xi:2009:NAACLHLT09,
  author    = {Chen, Lei  and  Zechner, Klaus  and  Xi, Xiaoming},
  title     = {Improved pronunciation features for construct-driven assessment of non-native spontaneous speech},
  booktitle = {Proceedings of Human Language Technologies: The 2009 Annual Conference of the North American Chapter of the Association for Computational Linguistics},
  month     = {June},
  year      = {2009},
  address   = {Boulder, Colorado},
  publisher = {Association for Computational Linguistics},
  pages     = {442--449},
  url       = {http://www.aclweb.org/anthology/N/N09/N09-1050}
}