1. University of Ruse,Department of Telecommunication,Ruse,Bulgaria
2. University of Ruse,Department of Electrical and Power Engineering,Ruse,Bulgaria
3. University of Telecommunications and Post,Department of Telecommunications,Sofia,Bulgaria
4. Almaty University of Power Engineering and Telecommunications named after Gumarbek Daukeyev,Almaty,Kazakhstan
5. Academy of logistics and transport,Almaty,Kazakhstan
6. University of Ruse,Department of Transport,Ruse,Bulgaria
7. Bandırma Onyedi Eylül University,Department of Computer Technologies,Bandırma,Türkiye