1. Ph.D. in Economics, Labour Resources and Entrepreneurship Department, National University of Water and Environmental Engineering, Ukraine
2. Doctor of Economics, Professor, Bioeconomy Research Institute, Vytautas Magnus university, Kaunas, Lithuania
3. Ph.D. in Economics, Associate Professor, Labour Resources and Entrepreneurship Department, National University of Water and Environmental Engineering, Ukraine
4. Doctor of Economics, Professor, Labour Resources and Entrepreneurship Department, National University of Water and Environmental Engineering, Ukraine; Faculty of Economics, Széchenyi Istvàn University, Hungary