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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.: ¬Die elektronische Bibliothek : Literatursuche und Literaturbeschaffung im Internet (1999)
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