Navale, G.K.B. “Botanical Resolution of Some Microstructures of Nevyeli Lignite, South India”. Journal of Palaeosciences 21, no. (1-3) (December 31, 1972): 359–364. Accessed May 20, 2024. https://www.jpsonline.co.in/index.php/jop/article/view/1498.