R. K. SINGH, K. N, SINGH, S. K. DHANORIA, A. BHATT, and A. DIXTT. “Petrochemistry and Depositional Environment of Permian Coals of Basundhara Block, Ib-Valley Coal Field, Orissa, India”. International Journal of Economic and Environmental Geology, vol. 1, no. 2, Jan. 2010, pp. 36-41, doi:10.46660/ijeeg.v1i2.615.