1. Department of Mathematics, Acharya Nagarjuna University, Ongole campus, Ongole, India
2. Division of Mathematics, Department of Sciences & Humanities, Vignan’s Foundation for Science, Technology and Research, Vadlamudi, India
3. Department of Mathematics, SASTRA Deemed University, Thanjavur, India
4. School of Mechanical and Building Sciences, Vellore Institute of Technology, Chennai, India