Samad, A., T. W. Khanzada, and C. Sushel. “COST EFFECTIVENESS OF TOPICAL GLYCERYL TRINITRATE VERSUS LATERAL INTERNAL SPHINCTEROTOMY FOR CHRONIC ANAL FISSURE”. Journal of Postgraduate Medical Institute, vol. 21, no. 1, Aug. 2011, https://jpmi.org.pk/index.php/jpmi/article/view/139.