1. Department of Mathematics, Karpagam Academy of Higher Education, Coimbatore, Tamil Nadu, India
2. Department of Science and Humanities, Karpagam Academy of Higher Education, Coimbatore, Tamilnadu, India
3. Process, Energy and Environmental Engineering Chair, School of Chemical and Bioengineering, Dire Dawa University Institute of Technology, Dire Dawa University, Dire Dawa 1362, Ethiopia