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3. Fluvial models of the Lower Permian Gondwana coal measures of Son-Mahanadi and Koel-Damodar basins;Casshyap,1984
4. Depositional model and tectonic evolution of Gondwana basins;Casshyap;Palaeobotanist,1987
5. Flurometric study of macerals and rank characterization of some Tertiary and Permian coals of India;Chakrabarti;Indian Miner.,1992