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Willett, P.: Best-match text retrieval (1993)
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- Library and information briefings. 1993, no.49, S.1-11
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Jones, G.; Robertson, A.M.; Willett, P.: ¬An introduction to genetic algorithms and to their use in information retrieval (1994)
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- Online and CD-ROM review. 18(1994) no.1, S.3-12