1. Department of Applied Mathematics, University of Johannesburg, Johannesburg, South Africa
2. Department of Mathematical Sciences, University of Malawi, Zomba, Malawi
3. Department of Insurance and Risk Management, University of Uyo, Uyo, Nigeria
4. Department of Decision Sciences, University of South Africa, Johannesburg, South Africa
5. Department of Mathematics and Statistics, Malawi University of Business and Applied Sciences, Blantyre, Malawi
6. Department of Geomatics and Surveying, Gwanda State University, Bulawayo, Zimbabwe
7. Department of Mathematics, University of Eswatini, Kwaluseni, Eswatini
8. Department of Basic Sciences, University of Health and Allied Sciences, Ho, Ghana
9. Department of Mathematical Sciences, University of Bath, Bath, UK