BUTT, K. A. Pyrochlore Group Minerals in Carbonatites from Loe-Shilman, Khyber Agency, N.W.F.P. Journal of Himalayan Earth Sciences, [S. l.], v. 14, n. 1, p. 111-122, 1981. Disponível em: http://ojs.uop.edu.pk/jhes/article/view/1161. Acesso em: 29 nov. 2024.