Bhattacharya, A. P. “Palynological Recognition of the Karharbari-Barakar Formations in the Sub-Surface Sediments of Wardha Coalfield, Maharashtra, India”. Journal of Palaeosciences, vol. 46, no. (1-2), Dec. 1997, pp. 217-9, doi:10.54991/jop.1997.1342.