Optimization models using fuzzy sets and possibility theory / ed. by J. Kacprzyk and S.A. OrlovskiMultiperson decision making models using fuzzy sets and possibility theory / ed. by Janusz Kacprzyk and Mario FedrizziConsensus under fuzziness / ed. by Janusz Kacprzyk, Hannu Nurmi, Mario FedrizziThe ordered weighted averaging operators : theory and applications / ed. by Ronald R. Yager and Janusz Kacprzyk