Michal Jezewski, Robert Czabanski, Jacek M. Leski. Introduction to Fuzzy Sets. In Piotr Prokopowicz, Jacek Czerniak, Dariusz Mikolajewski, Lukasz Apiecionek, Dominik Slezak, editors, Theory and Applications of Ordered Fuzzy Numbers - A Tribute to Professor Witold Kosiński. Volume 356 of Studies in Fuzziness and Soft Computing, pages 3-22, Springer, 2017. [doi]
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