1. Faculty of Applied Mathematics AGH University of Science and Technology aleja Adama Mickiewicza 30 Kraków 30‐059 Poland
2. Institute for Research and Applications of Fuzzy Modeling National Supercomputing Centre IT4Innovations, Division of the University of Ostrava 30. dubna 22 Ostrava 70103 Czech Republic
3. Instituto de Matemática e Estatística, da Universidade de São Paulo R. do Matão, 1010 ‐ Vila Universitaria São Paulo Brazil