1. Department of Mathematics, CHRIST (Deemed to be University), Bangalore, India
2. Laboratory of Systems Ecology and Sustainability Science, College of Engineering, Peking University, Beijing, People's Republic of China
3. Department of Mathematics and Statistics, Ripah International University, Islamabad, Pakistan
4. Department of Mathematics, CMR Institute of Technology, Bengaluru, India
5. Department of Basic Engineering Science, Faculty of Engineering, Menoufia University, Shebin El–Kom, Egypt
6. Department of Mathematics, College of Sciences and Humanities, Prince Sattam bin Abdulaziz University, Al–Kharj, Saudi Arabia
7. Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al–Qura University, Makkah, Saudi Arabia