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Longshu, L.; Xia, Z.: On an aproximate fuzzy information retrieval agent (1998)
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Quast, D.: Rationaliy, neural sets and deterministic chaos : knowledge organisation for the human mind; the user of libraries and information centres (1996)
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Fuzziness in database management systems (1995)
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Miyamoto, S.: Application of rough sets to information retrieval (1998)
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Tahani, V.: ¬A general conceptual framework for information retrieval systems (1972)
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