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Robertson, S.E.: Some recent theories and models in information retrieval (1980)
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Robertson, S.E.: Theories and models in information retrieval (1977)
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Robertson, S.E.: On term selection for query expansion (1990)
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Robertson, S.E.: On relevance weight estimation and query expansion (1986)
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Wilbur, W.J.: ¬A comparison of group and individual performance among subject experts and untrained workers at the document retrieval task (1998)
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