Ulavapalli, Gangadhara Reddy and Koyilapu, Rambabu and Charan, T. Gouri and Krishna, V. Murali and Reddy, G. V. Subba (2024) Coal quality enhancement by using bio extracts of carissa carandas fruits in combination with Hydro Fluoric acid. International Journal of Coal Preparation and Utilization. ISSN 1939-2699