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Bater, B.: Hyperdocuments through the square window (1994)
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Escher, A.: CD-ROM-Angebot von Datenbanken, eine Chance für den Endbenutzer (1990)
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Frappaolo, C.: Artificial intelligence and text retrieval : a current perspective on the state of the art (1992)
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Perez, E.: Text enhancement : Controlled vocabulary vs. free text (1982)
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Poynder, R.: Web research engines? (1996)
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