1. Department of Mathematics, COMSATS University Islamabad, Islamabad, Pakistan
2. Department of Mathematics, Faculty of Science, King Mongkut's University of Technology Thonburi, Bangkok, Thailand
3. Department of Chemistry, College of Science, Taif University, Taif, Saudi Arabia
4. Department of Science and Technology, University College-Ranyah, Taif University, Taif, Saudi Arabia
5. Department of Chemistry, Faculty of Science, Al-Azhar University, Cairo, Egypt