1. Matej Bel University, Banská Bystrica, Slovak Republic.
2. Matej Bel University in Banská Bystrica, Slovak Republic.
3. Odesa National University of Economics, Odesa, Ukraine.
4. Poltava V. G. Korolenko National Pedagogical University, Poltava, Ukraine.
5. State Institution "Luhansk Taras Shevchenko National University", Poltava, Ukraine.