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Radecki, T.: Mathematical model of information retrieval systems based on the concept of fuzzy thesaurus (1976)
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- Information processing and management. 12(1976), S.313-318
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Radecki, T.: Mathematical model and time effective information retrieval systems based on the theory of fuzzy sets (1977)
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- Information processing and management. 13(1977), S.109-116
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Radecki, T.: Fuzzy set theoretical approach to document retrieval (1979)
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- Information processing and management. 15(1979), S.247-259