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Robertson, M.; Willett, P.: ¬An upperbound to the performance of ranked output searching : optimal weighting of query terms using a genetic algorithms (1996)
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Clarke, S.J.; Willett, P.: Estimating the recall performance of Web search engines (1997)
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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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