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Cleverdon, C.W.: Evaluation tests of information retrieval systems (1970)
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Swanson, D.R.: Some unexplained aspects of the Cranfield tests of indexing performance factors (1971)
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Chan, L.M.: Alphabetical arrangement and subject collocation in Library of Congress Subject Headings (1977)
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Wilson, P.: ¬The end of specifity (1979)
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