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Hehl, H.: Kostenlose bibliographische Datenbanken im Internet (1998)
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Hehl, H.: ¬Das Internet als Quelle bibliographischer Ermittlung und elektronischer Beschaffung (1997)
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Hehl, H.: ¬Das Multisuchsystem E-Connect : Anwendungen von Javaskript für die Literatursuche und Literaturbeschaffung im Internet (1999)
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