Munir, A., S. Khushnood, and N. Ahmed. “EFFECT OF MATERIAL FLAWS ON THE MODAL PARAMETERS OF ISOTROPIC MATERIAL USING GROUND VIBRATION TESTING”. The Nucleus, vol. 50, no. 3, Aug. 2013, pp. 189-07, http://202.83.167.189/index.php/Nucleus/article/view/747.