| Aleksandr Tsarev |
Jeju National University |
South Korea |
Jeju |
| Alexey Kuzmin |
Universidade Federal do Rio Grande do Norte |
Brazil |
Natal |
| Azeef Muhammed Parayil Ajmal |
Ural Federal University |
Russia |
Ekaterinburg |
| Mitko Yanchev |
Sofia University 'St. Kliment Ohridski' |
Bulgaria |
Sofia |
| OJO AFOLABI MICHEAL |
AKINADE NIGERIA LIMITED |
NIGERIA |
LAGOS |
| Tinko Tinchev |
Sofia University St. Kliment Ohridski |
Bulgaria |
Sofia |
| Tran Hoai Ngoc Nhan |
Faculty of Basic Sciences, Vinh Long University of Technology Education |
Viet Nam |
Vinh Long |
| Wu Zhenfeng |
|
China |
Anhui |