@inproceedings{Mueller-Strube:2003:SIGDIAL,
  author = {Müller, Christoph and Strube, Michael},
  title = {Multi-Level Annotation in {MMAX}},
  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/W03-2117},
  year = 2003,
  pages = {198--207}