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Keen, M.: Interactive ranked retrieval using multiple match methods (1995)
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- Online information 95: Proceedings of the 19th International online information meeting, London, 5-7 December 1995. Ed.: D.I. Raitt u. B. Jeapes
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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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- Vol.1: Design; Vol.2: Test results
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Keen, M.: ¬The Okapi projects (1997)
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- Journal of documentation. 53(1997) no.1, S.84-87