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  1. Grill, E.: Relationale Datenbanken; vom logischen Konzept zur physischen Realisierung : Ziele, Methoden, Fallstudie (1990) 0.01
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    Issue
    4., aktualisierte u. erw. Aufl.
  2. Widhalm, R.; Mück, T.: Topic maps : Semantische Suche im Internet (2002) 0.00
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