Rai, Himanshu, et al. “Terricolous Lichens As Indicator of Anthropogenic Disturbances in a High Altitude Grassland in Garhwal (Western Himalaya), India”. Botanica Orientalis: Journal of Plant Science, vol. 8, Mar. 2012, pp. 16-23, doi:10.3126/botor.v8i0.5554.