@incollection{Brown-Burton75,
  author	= {Brown, J. S. and Burton, R. R.},
  editor	= {Bobrow, D. G. and Collins, A.},
  year		= {1975},
  title		= {Multiple Representations of Knowledge for Tutorial Reasoning},
  booktitle	= {Representation and Understanding},
  pages		= {311--349},
  publisher	= {Academic Press},
  address	= {New York}
}