@InProceedings{christensen-EtAl:2009:BioNLP,
  author    = {Christensen, Lee  and  Harkema, Henk  and  Haug, Peter  and  Irwin, Jeannie  and  Chapman, Wendy},
  title     = {ONYX: A System for the Semantic Analysis of Clinical Text},
  booktitle = {Proceedings of the BioNLP 2009 Workshop},
  month     = {June},
  year      = {2009},
  address   = {Boulder, Colorado},
  publisher = {Association for Computational Linguistics},
  pages     = {19--27},
  url       = {http://www.aclweb.org/anthology/W/W09/W09-1303}
}