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Kraft, D.; Bordogna, G.; Pasi, G.: Fuzzy set theory (2009)
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Tahani, V.: ¬A general conceptual framework for information retrieval systems (1972)
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Everett, D.M.; Cater, S.C.: Topology of document retrieval systems (1992)
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Marzano, G.: Introduzione alla teoria degli insiemi fuzzy (1992)
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Miyamoto, S.: Information clustering based an fuzzy multisets (2003)
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