Malik, I. A., D. R. Cohen, and A. C. Dunlop. “Geochemical Aspects of Uranium in the Sumayar Valley, Northern Areas of Pakistan”. Journal of Himalayan Earth Sciences, vol. 37, no. 1, Nov. 2004, pp. 1-25, http://ojs.uop.edu.pk/jhes/article/view/1571.