TAHIRKHELI, R. A. K.; JAN, M. Q.; MIAN, I. Hydrothermal Graphite in Yirah, Khyber Agency. Journal of Himalayan Earth Sciences, [S. l.], v. 6, n. 1, p. 114-119, 1971. Disponível em: http://ojs.uop.edu.pk/jhes/article/view/1114. Acesso em: 28 nov. 2024.