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  1. Gabriel, R.; Röhrs, H.-P.: Datenbanksysteme : Konzeptionelle Datenmodellierung und Datenbankstrukturen (1995) 10.60 
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  2. Gabriel, R.; Röhrs, H.-P.: Gestaltung und Einsatz von Datenbanksystemen : Data Base Engineering und Datenbankarchitekturen (2003) 10.60 
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