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Pollandt, S.: Fuzzy-Begriffe : Formale Begriffsanalyse unscharfer Daten (1997)
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Longshu, L.; Xia, Z.: On an aproximate fuzzy information retrieval agent (1998)
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Kraft, D.; Bordogna, G.; Pasi, G.: Fuzzy set theory (2009)
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Fuzziness in database management systems (1995)
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Panyr, J.: Relevanzproblematik in Information-Retrieval-Systemen (1986)
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