1. Department of Chemistry University of North Bengal Darjeeling 734013 India
2. Department of Chemistry Malda College Malda 732101 India
3. Department of Chemistry Government General Degree College at Pedong Kalimpong 734311 India
4. Department of Chemistry Gorubathan Government College Kalimpong 735231 India
5. Department of Biotechnology University of North Bengal Darjeeling 734013 India
6. Department of Chemistry Indian Institute of Technology Patna Patna 801103, Bihar India