@inproceedings{Takeoka-etAl:2003:SIGDIAL,
  author = {Takeoka, Atsue  and  Shimojima, Atsushi  and  Katagiri, Yasuhiro},
  title = {Turn-taking in Graphical Communication: an exploratory study },
  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/W03-2119},
  year = 2003,
  pages = {34--38}