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author_ss:"Robertson, S.E."
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language_ss:"e"
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theme_ss:"Retrievalstudien"
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year_i:[1980 TO 1990}
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Robertson, S.E.: ¬The methodology of information retrieval experiment (1981)
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Robertson, S.E.; Thompson, C.L.: ¬An operational evaluation of weighting, ranking and relevance feedback via a front-end system (1987)
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