@incollection{CarberryClarke97,
  author	= {Carberry, Sandra and Clarke, John R.},
  editor	= {Jameson, A. and Paris, C. and Tasso, C.},
  title		= {Generating clinical exercises of varying difficulty},
  booktitle	= {Proceedings of the Sixth International Conference on User Modeling (UM97)},
  pages		= {273--275},
  year		= {1997},
  address	= {Berlin},
  month		= jun,
  address	= {Berlin, New York},
  publisher	= {Springer},
  note		= {(Chia Laguna, Sardinia, Italy)}
}