Majid, M., S. . Danishwar, and S. Hamidullah. “Petrographic and Chemical Variations in The Rift-Related Basic Dykes of the Malka Area (Lower Swat), N. W. F. P., Pakistan”. Journal of Himalayan Earth Sciences, vol. 24, no. 1, Nov. 1991, pp. 1-23, http://ojs.uop.edu.pk/jhes/article/view/1387.