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Cooper, W.S.: ¬A definition for relevance in information retrieval (1971)
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Cooper, W.S.: ¬The paradoxal role of unexamined documents in the evaluation of retrieval effectiveness (1976)
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Cooper, W.S.: ¬On selecting a measure of retrieval effectiveness, revisited (1973)
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Cooper, W.S.: Indexing documents by Gedanken experimentation (1978)
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