Bhutta, Irtiza Ahmed, and Muhammad Tariq. 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.