1. Institute of Thermal Machinery; Częstochowa University of Technology; Armii Krajowej 21 42-201 Czestochowa Poland
2. Department of Energy and Environment; Instituto de Carboquímica (ICB-CSIC); Miguel Luesma Castan, 4 50018 Zaragoza Spain
3. The Strata Mechanics Research Institute of the Polish Academy of Sciences; Reymonta 27 30-059 Cracow Poland