@Book{SIGDIAL:2009,
  editor    = {Patrick G. T. Healey  and  Roberto Pieraccini},
  title     = {Proceedings of the SIGDIAL 2009 Conference},
  month     = {September},
  year      = {2009},
  address   = {London, UK},
  publisher = {Association for Computational Linguistics},
  url       = {http://www.aclweb.org/anthology/W09-39}
}