1. Department of Mathematics and Actuarial Science, Kenyatta University, Nairobi, Kenya
2. Department of Mathematical Sciences, Adekunle Ajasin University, Akungba Akoko, Nigeria
3. Department of Mathematics and Statistics, Federal Polytechnic, Ilaro, Nigeria
4. Fluid Dynamics and Survey Research Group, Department of Mathematical Sciences, Federal University of Technology, Akure, Nigeria
5. Department of Mathematical Sciences, United Arab Emirates University, Abu Dhabi, UAE