1. Department of Mathematics & Natural Sciences, Prince Mohammad Bin Fahd University, AlKhobar, Saudi Arabia
2. Govt. Degree College, Kotdwar, India
3. Department of Chemistry, Govt. (PG) College Jaiharikhal, Pauri, India
4. Raj Kumar Goel institute of Technology, Ghaziabad, India
5. Department of Applied Sciences and Engineering, Tula’s Institute, Dehradun, India