1. Department of Mathematics, Acharya Nagarjuna University Campus, Ongole, Andhra Pradesh, India
2. Department of Mathematics, Swarnandhra Institute of Engineering and Technology, Narasapuram, Andhra Pradesh, India
3. Department of Mathematics, Lakireddy Bali Reddy College of Engineering, Mylavaram, Andhra Pradesh, India
4. Faculty of Engineering, Kuwait College of Science and Technology, Doha, Kuwait