1. Department of Mathematics-SAS, VIT Vellore, Vellore, Tamil Nadu, India
2. Department of Applied Science and Humanities, Inderprastha Engineering College, Ghaziabad, U.P, India
3. Department of Applied Mathematics, University Politehnica of Bucharest, 060042 Bucharest, Romania
4. Academy of Romanian Scientists, 54 Splaiul Independentei, 050094 Bucharest, Romania
5. "Fundamental Sciences Applied in Engineering" Research Center (SFAI), University Politehnica of Bucharest, 060042 Bucharest, Romania
6. Department of Mathematics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand