Lotfi A. Zadeh. Fuzzy Logic - a New Direction. The Concept of f-Validity. In Martin Stepnicka, Vilém Novák, Ulrich Bodenhofer, editors, New Dimensions in Fuzzy Logic and Related Technologies. Proceedings of the 5th EUSFLAT Conference, Ostrava, Czech Republic, September 11-14, 2007, Volume 1: Invited Lectures and Special Sessions. pages 29-29, Universitas Ostraviensis, 2007. [doi]
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