1. Alkonde SO, Hoffknecht A, Erdtmann BD (1992) Rank and petrographic composition of selected Upper Cretaceous and Tertiary coals of Southern Nigeria. Int J Coal Geol 20:209–224
2. Amijaya H, Littke R (2005) Microfacies and depositional environment of Tertiary Tanjung Enim low rank coal, South Sumatra basin, Indonesia. Int J Coal Geol 61:197–221
3. BIS (2003) Methods of test for coal and coke (2nd revision of IS: 1350). Part I, Proximate analysis. Bureau of Indian Standard, pp. 1–29
4. Blanford WT, Blanford HF, Theobald T (1856) On the geological structure and relations of Talcher coalfield in the district of Cuttuck. Mem Geo Survey India 1:1–98
5. Calder JH, Gibbing MR, Mukhopadhay PK (1991) Peat formation in a Westphalian B piedmont setting, Cumberland Basin, Nova Scotia: Implication for the maceral-based interpretation of rheotrophic and raised paleomires. Bull De La Soc Geol De France 162:283–298