E.D. Falkenberg. Canonical Entity-Relation Structures. Technical report: 87-09, Vakgroep Informatiesystemen, University of Nijmegen, The Netherlands, 1987, Research report.
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E.D. Falkenberg. A Language for Manipulating Conservative Data Bases. Technical report, Department of Information Systems, University of Nijmegen, Nijmegen, The Netherlands, EU, 1987.
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E.D. Falkenberg. Time and Update in Information Systems. Technical report, Department of Information Systems, University of Nijmegen, The Netherlands, 1987.
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Th.P. van der Weide. Recursive NIAM schemas considered charmful. Technical report, Department of Information Systems, University of Nijmegen, The Netherlands, 1987.
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