1. Department of Basic Sciences, Preparatory Year, King Faisal University, Al-Ahsa 31982, Saudi Arabia
2. Department of Mathematics, College of Science, King Faisal University, Al-Ahsa 31982, Saudi Arabia
3. Department of Mathematics, University of Management and Technology, Lahore 54770, Pakistan
4. Department of Mathematics and Applied Mathematics, Sefako Makgatho Health Sciences University, Pretoria 0204, South Africa
5. Department of Mathematics, Michael Okpara University of Agriculture, Umudike 440101, Abia State, Nigeria
6. Department of Mathematics, Quaid-i-Azam University, Islamabad 45320, Pakistan