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Hehl, H.: Änderungen und Erweiterungen im Multisuchsystem E-Connect (2000)
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Hehl, H.: Ein Linksystem zur Integration von Literatursuche und Literaturbeschaffung : Medline-LINK (2000)
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Hehl, H.: ¬Die Linksysteme des Multisuchsystems E-Connect : Aufsatzrecherche mit Zugang zum Volltext und zu Verbundkatalogen (2003)
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Hehl, H.: Allgemeines Suchsystem für Elektronische Zeitschriften und Aufsätze (ASEZA) (2009)
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Hehl, H.: Verknüpfung von MathDatabase mit elektronischen Aufsätzen und Verbundkatalogen : ¬Das Linksystem Math-Link (2001)
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Hehl, H.: ¬Die elektronische Bibliothek : Literatursuche und Literaturbeschaffung im Internet (2001)
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