Boruah, A., B. Kumar, P. H. Rao, and T. Harinarayana. “Integrated Development Of Both Conventional And Unconventional Coal Fuels In India”. The International Journal of Science & Technoledge, vol. 1, no. 11, Nov. 2013, http://internationaljournalcorner.com/index.php/theijst/article/view/128086.