@inproceedings{Bos-etAl:2003:SIGDIAL,
  author = {Bos, Johan  and  Klein, Ewan  and  Lemon, Oliver  and  Oka, Tetsushi},
  title = {{DIPPER}: Description and Formalisation of an Information-State Update Dialogue System Architecture },
  booktitle = {Proceedings of the Fourth {SIGdial} Workshop on Discourse and Dialogue},
  editor = {Akira Kurematsu and Alexander Rudnicky and Syun Tutiya},
  url = {http://www.aclweb.org/anthology/W03-2123},
  year = 2003,
  pages = {115--124}