Sayab, M., M. A. Khan, and M. Rafiq. “Rotated and Displaced Clay Balls As Kinematic Indicators Along Shear Zones in Sandstones of the Siwalik Group of Surghar-Shinghar Range, Trans-Indus Ranges, Pakistan”. Journal of Himalayan Earth Sciences, vol. 32, no. 1, Nov. 1999, pp. 89-104, http://ojs.uop.edu.pk/jhes/article/view/1525.