Malik, Masood Akhtar, et al. “INITIAL EXPERIENCE OF PERCUTANEOUS NEPHROLITHOTOMY IN HAZARA REGION”. Journal of Ayub Medical College Abbottabad, vol. 30, no. 2, Mar. 2018, pp. 241-4, https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/1759.