@Book{SIGDIAL2011:2011,
  editor    = {Joyce Y. Chai  and  Johanna D. Moore  and  Rebecca J. Passonneau  and  David R. Traum},
  title     = {Proceedings of the SIGDIAL 2011 Conference},
  month     = {June},
  year      = {2011},
  address   = {Portland, Oregon},
  publisher = {Association for Computational Linguistics},
  url       = {http://www.aclweb.org/anthology/W11-20}
}