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