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Koubarakis, M.: Database models for infinite and indefinite temporal information (1994)
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Davies, R.: Q-analysis : a methodology for librarianship and information science (1985)
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Jouis, C.: Logic of relationships (2002)
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Turunen, E.: Mathematics behind fuzzy logic (1999)
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Egghe, L.: Vector retrieval, fuzzy retrieval and the universal fuzzy IR surface for IR evaluation (2004)
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