@article{1993-Hofstede-PSM,
  author		= "Hofstede, A.H.M. ter and Weide, Th.P. van der",
  title			= "{Expressiveness in conceptual data modelling}",
  journal		= "Data \& Knowledge Engineering",
  number		= "1",
  volume		= "10",
  month			= "February",
  year			= "1993",
  research_group	= "iris",
  pages			= "65--100",
  class			= "Journal"
}