@incollection{Gulla-etal91,
  author	= {Gulla, Jon Atle and Lindland, O. I. and Willumsen, G.},
  editor	= {Andersen, R. and Jr., J. A. Bubenko and Solvberg, A.},
  title		= {PPP: an integrated CASE environment},
  booktitle	= {Proceedings of the Third International Conference on Advanced Information Systems Engineering (CAiSE'91)},
  pages		= {194--221},
  year		= {1991},
  note		= {Trondheim},
  address	= {Berlin, New York},
  publisher	= {Springer}
}