1. School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Durban, South Africa
2. Mountain Top University, Prayer City, Ogun State Nigeria
3. Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
4. Department of Basic Engineering, Faculty of Engineering, Menoufia University, Shibin el Kom 32511, Egypt