1. Department of Mathematical Modeling, Kaunas University of Technology, Studentu 50, 51368 Kaunas, Lithuania
2. Department of Economics, Entrepreneurship and Business Administration, Sumy State University, Kharkivska Str., 116, 40007 Sumy, Ukraine
3. Sustainable Economics Research Group, Kaunas University of Technology, Gedimino 50, 44249 Kaunas, Lithuania