1. National Technical University “Kharkiv Polytechnic Institute”,Department of Physics,Kharkiv,Ukraine
2. Universitat Pompeu Fabra,Department of Economics and Business,Barcelona,Spain
3. Ontario Public Service Toronto,Ontario,Canada
4. J. J. Strossmayer University of Osijek,Faculty of Tourism and Rural Development Pozega,Osijek,Croatia
5. Uzhhorod national university,Faculty of Economics,Uzhhorod,Ukraine
6. National Technical University “Kharkiv Polytechnic Institute”,Department of General Economic Theory,Kharkiv,Ukraine