@inproceedings{1991-Spiegel-TransMod,
  author		= "Spiegel, P.L. van der and Driessen, J.T.W. and Bruza, P.D. and Weide, Th.P. van der",
  title			= "{A Transaction Model for Hypertext}",
  booktitle		= "{Proceedings of the Data Base and Expert System Applications Conference (DEXA 91), Berlin, Germany, EU}",
  editor		= "Karagiannis, D.",
  publisher		= "Springer",
  year			= "1991",
  code			= "icis.91-5",
  research_group	= "iris",
  pages			= "281--286",
  class			= "Conference"
}