KHAN, Z.; BIBI, S. Removal of trace elements from Thar coal to minimize its hazardous effect on the environment. Journal of Himalayan Earth Sciences, [S. l.], v. 49, n. 1, p. 50-57, 2016. Disponível em: http://ojs.uop.edu.pk/jhes/article/view/1928. Acesso em: 2 jun. 2025.