1. Volodymyr Dahl East Ukrainian National University, Kyiv, Ukraine.
2. V.N. Karazin Kharkiv National University, Kharkiv, Ukraine.
3. Chernihiv Polytechnic National University, Chernihiv, Ukraine.
4. Oleksandr Dovzhenko Hlukhiv National Pedagogical University, Glukhiv, Sumy Region, Ukraine.
5. Sumy National Agrarian University, Sumy, Ukraine.