Tahir, M., S. Hussain, Z. U. . Rehman, N. Muhammad, M. Nazir, and M. Sadiq. “Evaluating the Effect of Grain Size on Mechanical Parameters of Rocks from Different Areas of Khyber Pakhtunkhwa, Pakistan”. Journal of Himalayan Earth Sciences, vol. 52, no. 1, Mar. 2019, pp. 120-7, http://ojs.uop.edu.pk/jhes/article/view/1853.