F. K. Khan, M. Shah, I. A. Sheikh, K. Mahmood, and N. Hassan, “Modified Graham’s Patch Repair Versus Graham’s Patch Repair for Treatment of Perforated Peptic Ulcer in Terms of Postoperative Morbidity / Mortality”, PAFMJ, vol. 72, no. 1, pp. 323–26, Mar. 2022.