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Cleverdon, C.W.; Mills, J.; Keen, M.: Factors determining the performance of indexing systems : ASLIB Cranfield research project (1966)
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Keen, M.: Query reformulation in ranked output interaction (1994)
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Keen, M.: Interactive ranked retrieval using multiple match methods (1995)
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Keen, M.: ¬The Okapi projects (1997)
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Keen, M.: Cyril W. Cleverdon (1998)
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