Ullah, Amin, et al. “FREQUENCY AND FACTORS EFFECTING NON CLEARANCE OF LOWER POLE RENAL STONES”.
Journal of Ayub Medical College Abbottabad
, vol. 27, no. 2, June 2015, pp. 384-7, https://www.jamc.ayubmed.edu.pk/index.php/jamc/article/view/42.