1. Department of Mathematics , Sri Eshwar College of Engineering(Autonomous) , Coimbatore 641202, Tamil Nadu , India
2. Post Graduate and Research Department of Mathematics , Kongunadu Arts and Science College(Autonomous) , Coimbatore 641029, Tamil Nadu , India
3. Faculty of Sciences and Techniques , Moulay Ismail University of Meknes , Errachidia 52000 , Morocco
4. Harran University, Faculty of Education , Sanliurfa , Turkey