1. Department of Mathematics, College of Engineering and Technology, Srinivas University, Mangalore 574146, India
2. Department of Mathematics, Alliance School of Applied Mathematics, Bangalore 562106, India
3. Department of Mathematics, Comsats University Islamabad, Lahore Campus, Lahore, Pakistan
4. Department of Mathematics, Addis Ababa University, Addis Ababa, Ethiopia
5. Department of Chemistry, College of Engineering and Technology, Srinivas University, Mangalore 574146, India