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  1. Porstmann, R.: ¬Eine universelle Fachklassifikation Wirtschaftswissenschaften : ein Entwurf für Bibliotheken, Dokumentations- und Informationseinrichtungen (1995) 10.60 
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    Porstmann, R.
  2. Porstmann, R.: Ansätze professioneller Informationsvermittlung im Internet (1996) 10.60 
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