Khattak, I. K., M. Irshad, Z. Ullah, and R. Gul. “Obstructive Uropathy Percutaneous Nephrostomy in Seriously Ill Patients”. Journal of Postgraduate Medical Institute, vol. 10, no. 1, Aug. 2011, https://www.jpmi.org.pk/index.php/jpmi/article/view/522.