Khan, Zafar, and Saqiba Bibi. “Removal of Trace Elements from Thar Coal to Minimize Its Hazardous Effect on the Environment”. Journal of Himalayan Earth Sciences 49, no. 1 (March 31, 2016): 50-57. Accessed June 2, 2025. http://ojs.uop.edu.pk/jhes/article/view/1928.