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Hehl, H.: ¬Das Internet als Quelle bibliographischer Ermittlung und elektronischer Beschaffung (1997)
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Hehl, H.: Kostenlose bibliographische Datenbanken im Internet (1998)
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Hehl, H.: Bibliographische Recherche im Internet : ein Leitfaden für die Praxis (1997)
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Hehl, H.: Ein Linksystem zur Integration von Literatursuche und Literaturbeschaffung : Medline-LINK (2000)
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Hehl, H.: Änderungen und Erweiterungen im Multisuchsystem E-Connect (2000)
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Hehl, H.: ¬Die elektronische Bibliothek : Literatursuche und Literaturbeschaffung im Internet (1999)
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Hehl, J.: Linksysteme : Einfache und effektive Verfahren mittels Webformularen (2005)
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