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classification_ss:"ST 271 Informatik / Monographien / Software und -entwicklung / Datenbanken, Datenbanksysteme, Data base management, Informationssysteme / Einzelne Datenbanksprachen und Datenbanksysteme"
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subject_ss:"Information Retrieval"
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subject_ss:"Information storage and retrieval systems"
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Rijsbergen, C.J. van: Information retrieval (1979)
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