Shah, M. T., R. I. Thorpe, and S. A. Siddique. “Lead Isotope Signature of the Proterozoic Sediment-Hosted Base Metal Deposits at the Margin of the Indian Plate in Besham Area, Northern Pakistan”. Journal of Himalayan Earth Sciences, vol. 25, no. 1, Nov. 1992, pp. 59-65, http://ojs.uop.edu.pk/jhes/article/view/1428.