1. National Technical University “Kharkiv Polytechnic Institute”,Department of General Economic Theory,Kharkiv,Ukraine
2. Uzhhorod national university,Faculty of Economics,Uzhhorod,Ukraine
3. Universitat Pompeu Fabra,Department of Economics and Business,Barcelona,Spain
4. National Technical University “Kharkiv Polytechnic Institute”,Department of Physics,Kharkiv,Ukraine