@article{SitterStein96,
  author	= {Sitter, Stefan and Stein, Adelheit},
  year		= {1996},
  title		= {Modeling Information-Seeking Dialogues: The \em Conversational \em Roles Model},
  journal	= {Review of Information Science},
  volume	= {1},
  number	= {1},
  note		= {(On-line journal; date of verification: 20.1.1998)},
  URL		= {http://www.inf-wiss.uni-konstanz.de/RIS},
  urlpage	= {http://www.inf-wiss.uni-konstanz.de/RIS}
}