@InProceedings{williams:2012:SDCTD,
  author    = {Williams, Jason},
  title     = {A belief tracking challenge task for spoken dialog systems},
  booktitle = {NAACL-HLT Workshop on Future directions and needs in the Spoken Dialog Community: Tools and Data (SDCTD 2012)},
  month     = {June},
  year      = {2012},
  address   = {Montr{\'e}al, Canada},
  publisher = {Association for Computational Linguistics},
  pages     = {23--24},
  url       = {http://www.aclweb.org/anthology/W12-1812}
}