1. Abdus Salam School of Mathematical Sciences, Government College University, Lahore, Pakistan
2. Department of Mathematics, Texas A&M University, College Station, TX, USA
3. Department of Mathematics, Quiad i Azam University, Islamabad, Pakistan
4. Department of Mathematics and Social Sciences, Sukkur IBA University, Sukkur, Sindh, Pakistan
5. Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia
6. Faculty of mechanics and mathematics, Al-Farabi Kazakh National University, Almaty, Kazakhstan