@incollection{Levelt82,
  author	= {Levelt, Willem J. M.},
  editor	= {Peters, Stanley and Saarinen, E.},
  title		= {Linearization in Describing Spatial Networks},
  booktitle	= {Processes, Beliefs and Questions},
  publisher	= {Reidel},
  year		= {1982},
  address	= {Dordrecht, Holland}
}