1. Centre of Mathematical Needs, Department of Mathematics, CHRIST (Deemed to be University), Bangalore 560029, Karnataka, India
2. Department of Mathematics, Government Degree College Jangaon, Telangana, India
3. Department of Mathematics, MS Ramaiah Institute of Technology, Bengaluru 560054, India
4. Department of Engineering and Architecture, University of Parma, Parco Area Delle Scienze 181/A, 43124 Parma, Italy