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Gebhardt, F.: Dokumenten-Retrieval und Künstliche Intelligenz (1987)
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- Handbuch der modernen Datenverarbeitung. 24(1987) H.133, S.37-46
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Gebhardt, F.: Querverbindungen zwischen Information-Retrieval- und Experten-Systemen (1985)
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- Nachrichten für Dokumentation. 36(1985) H.6, S.255-263