@techreport{1992-Hofstede-SchemaEquiv,
  author		= "Hofstede, A.H.M. ter and Proper, H.A. and Weide, Th.P. van der",
  title			= "{A Note on Schema Equivalence}",
  number		= "CSI--R9230",
  institution		= "Department of Information Systems, University of Nijmegen",
  address		= "Nijmegen, The Netherlands, EU",
  year			= "1992",
  research_group	= "iris",
  class			= "Report"
}