@incollection{Zadeh79,
  author	= {Zadeh, L. A.},
  editor	= {Michie, D. and Hayes, J. E. and Mikulich, L. I.},
  year		= {1979},
  title		= {A Theory of Approximate Reasoning},
  booktitle	= {Machine Intelligence 9},
  publisher	= {Ellis Horwood Limited},
  address	= {Chichester, England}
}