1. Department of Mathemtics, Government College University Lahore (GCUL), Lahore 54000, Pakistan
2. Department of Mathematics, University of Gujrat, Gujrat 50700, Pakistan
3. Department of Mathematics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
4. Department of Applied Mathematics, University Politehnica of Bucharest, Bucharest 060042, Romania
5. Academy of Romanian Scientists, 54 Splaiul Independentei, Bucharest 050094, Romania
6. Fundamental Sciences Applied in Engineering" Research Center (SFAI), University Politehnica of Bucharest, Bucharest 060042, Romania