SHUKLA, R. R.; SIDDHARTH, S. Petrological basis for rank (maturity) determination of Permian coals from Pathakhera coal belt, Satpura Basin, M. P., India. Journal of Nepal Geological Society, [S. l.], v. 23, p. 13–18, 2001. DOI: 10.3126/jngs.v23i0.31862. Disponível em: https://nepjol.info/index.php/JNGS/article/view/31862. Acesso em: 17 aug. 2024.