Tahirkheli, T., M. T. Shah, T. Khan, and M. A. Khan. “Fluid Inclusion Studies of the Copper-Bearing Quartz Veins in Gowuch Formation, Drosh-Shishi Area, Chitral, Northern Pakistan”. Journal of Himalayan Earth Sciences, vol. 29, no. 1, Nov. 1996, pp. 51-57, http://ojs.uop.edu.pk/jhes/article/view/1485.