Jan, M. Q., and M. A. Khan. “Petrology of Gem Peridot from Sapat Mafic-Ultramafic Complex, Kohistan, NW Himalaya”. Journal of Himalayan Earth Sciences, vol. 29, no. 1, Nov. 1996, pp. 17-26, http://ojs.uop.edu.pk/jhes/article/view/1482.