Gupta, S., Khare, R., Bajpai, O., Rai, H., Upreti, D. K., Gupta, R. K. and Sharma, P. K. (2016) “Lichen as Bioindicator for Monitoring Environmental Status in Western Himalaya, India”, International Journal of Environment, 5(2), pp. 1–15. doi: 10.3126/ije.v5i2.15001.