Gulzar, Jasneet Singh, Shivani B. Paruthy, and Satya Vrat Arya. “Improving Outcome in Perforated Peptic Ulcer Emergency Surgery by Boey Scoring”. International Surgery Journal 3, no. 4 (December 10, 2016): 2120–2128. Accessed October 13, 2025. https://www.ijsurgery.com/index.php/isj/article/view/163.