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Robertson, M.A.: Windows 3.0 for the online searcher (1991)
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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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Warner, J.: Retrieval performance tests in relation to online bibliographic searching (1992)
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Meadow, C.T.: Speculations on the measurement and use of user characteristics in information retrieval experimentation (1994)
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