1. Faculty of Electronic Engineering, Department of Telecommunications, Niš
2. Texas A&M University at Qatar, Science Program, Doha, Qatar
3. Wuhan Donghu University, School of Electronics and Information Engineering, Wuhan, People’s Republic of China
4. Tshwane University of Technology, Department of Mathematics and Statistics, Pretoria, South Africa
5. Tshwane University of Technology, Department of Mathematics and Statistics, Pretoria, South Africa + King Abdulaziz University, Faculty of Science, Department of Mathematics, Jeddah, Saudi Arabia