@article{1992-Hofstede-PSMPromoNL,
  author		= "Hofstede, A.H.M. ter and Proper, H.A. and Weide, Th.P. van der",
  title			= "{PSM: Datamodelleren in het Kwadraat}",
  journal		= "DB/Magazine",
  number		= "4",
  volume		= "3",
  month			= "June",
  year			= "1992",
  note			= "In Dutch",
  code			= "icis.92-13",
  research_group	= "iris",
  pages			= "37--41",
  class			= "Professional"
}