1. University of North Bengal, Department of Chemistry, Raja Rammohanpur, Darjeeling, West Bengal, India 734013
2. Parimal Mitra Smriti Mahavidyalaya, Department of Chemistry, Malbazar Jalpaiguri, West Bengal, India 735221
3. Alipurduar University, Department of Chemistry, Alipurduar, West Bengal, India 736122
4. University of North Bengal, Department of Biotechnology, Raja Rammohanpur, Darjeeling, West Bengal, India 734013