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author_ss:"Robertson, A.M."
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author_ss:"Willett, P."
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theme_ss:"Semantisches Umfeld in Indexierung u. Retrieval"
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Ekmekcioglu, F.C.; Robertson, A.M.; Willett, P.: Effectiveness of query expansion in ranked-output document retrieval systems (1992)
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Robertson, A.M.; Willett, P.: Applications of n-grams in textual information systems (1998)
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