1. Ahmed, M. (1996). Petrology of oligocene coal, makum coalfield, Assam, Northeast India. International Journal of Coal Geology, 30(4), 319–325.
2. Banerjee, B. D., Singh, A. K., Kispotta, J., & Dhar, B. B. (1994). Trend of methane emission to the atmosphere from Indian coal mining. Atmospheric Environment, 28(7), 1351–1352.
3. Bibler, C. J., Marshall, J. S., & Pilcher, R. C. (1998). Status of worldwide coal mine methane emissions and use. International Journal of Coal Geology, 35(1), 283–310.
4. Botsaris, G. D., & Glazman, Y. M. (1989). Stability and rheology of coal slurries (p. 200). New York: Marcel Dekker.
5. Chakraborty, A., Tiwari, P. K., & Singh, A. K. (2011). Coalbed methane exploration in a tertiary lignite basin, North Gujarat, India. In The 2nd South Asian Geosciences Conference and Exhibition, GEOIndia. Available at http://apgindia.org/pdf/510.pdf .