@techreport{1999-Wondergem-IndexExpressions,
  author		= "Wondergem, B.C.M. and Bommel, P. van and Weide, Th.P. van der",
  title			= "{Compactness of Boolean Index Expressions}",
  number		= "CSI--R9911",
  month			= "June",
  institution		= "Radboud University Nijmegen",
  organization		= "Radboud University Nijmegen",
  year			= "1999",
  code			= "icis.CSI-R9911",
  research_group	= "icis",
  class			= "Report"
}