[1] Sumy State Univ, Int Econ Relat Dept, UA-40007 Sumy, Ukraine
[2] Sumy State Univ, Dept Econ Entrepreneurship & Business Adm, UA-40007 Sumy, Ukraine
[3] Univ Geneva, Inst Environm Sci, Renewable Energy Syst Grp, CH-1211 Geneva, Switzerland
[4] Estonian Entrepreneurship Univ Appl Sci, Tallinn 11415, Estonia
[5] Sumy State Makarenko Pedag Univ, Dept Business Econ & Adm, UA-40000 Sumy, Ukraine
[6] Lublin Univ Technol, Fac Management, PL-20618 Lublin, Poland
[7] Natl Tech Univ Ukraine Igor Sikorsky Kyiv Polytech, Dept Econ & Entrepreneurship, UA-03056 Kyiv, Ukraine