1. Faculty of Economics and Management, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
2. Faculty of Physics, Mathematics and Optometry, University of Latvia, Riga, Latvia
3. Department of Heat Engineering and Thermal and Nuclear Power Plants, Lviv Polytechnic National University, Lviv, Ukraine
4. Department of Biology and Methods Biology Teaching, Sumy State Pedagogical University named after A.S. Makarenko, Sumy, Ukraine