Farhaduzzaman, M., Abdullah, W. H., Islam, M. A., & Sia, S. G. (2015). Quality Assessment of the Permian Coals from Dighipara Basin, Bangladesh Based On Proximate, Ultimate and Microscopic Analyses. Journal of Bangladesh Academy of Sciences, 39(2), 177–194. https://doi.org/10.3329/jbas.v39i2.25951