1. Department of Mathematics, Quaid-I-Azam University, Islamabad, Pakistan + Department of Physics, Faculty of Science, King Saud University, Riyadh, Saudi Arabia
2. Department of Mathematics, Quaid-I-Azam University, Islamabad, Pakistan
3. Research Centre for Modeling and Simulation (RCMS), National University of Sciences and Technology (NUST), Sector H, Islamabad, Pakistan
4. Department of Physics, Faculty of Science, King Saud University, Riyadh, Saudi Arabia