1. Department of Mathematics, Faculty of Exact Sciences, University the Brothers Mentouri Constantine 1, Constantine, Algeria
2. Department of Statistics and Operations Research, College of Science, King Saud University, P.O. Box 2455, Riyadh, Saudi Arabia
3. LaPS Laboratory, Badji Mokhtar–Annaba University, Annaba, Algeria
4. Department of Mathematics, Faculty of Science, Tanta University, Tanta, Egypt
5. School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne, U.K
6. Faculty of Science and Humanities, School of Postgraduate Studies and Research (SPGSR), Amoud University, Borama, Somalia