Saha, Sujan, B.K. Sharma, Prakash Chavan, S. Datta, G. Sahu, B.K. Mall, and T. Sharma. 2011. “Effect of Inorganic Matter on the Reactivity of Indian Coals”. Asian Journal of Chemistry 23 (10):4335-40. https://asianpubs.org/index.php/ajchem/article/view/10854.