Bhutta, I. A., & Tariq, M. (2009). SINGLE DOSE CAUDAL TRAMADOL VERSUS BUPIVACAINE FOR POSTOPERATIVE ANALGESIA IN PERINEAL SURGERY: Postoperative Analgesia in Perineal Surgery. Pakistan Armed Forces Medical Journal, 59(3), 332-37. https://pafmj.org/PAFMJ/article/view/1790