@book{compling-usermodeling,
  author	= {Kobsa, Alfred and Wahlster, Wolfgang},
  year		= {1988},
  title		= {Computational Linguistics: Special issue on User Modeling},
  volume	= {14},
  publisher	= {The M.I.T. Press},
  note		= {number 3},
  address	= {Cambridge, MA}
}