Nigam, Vinod Kumar, and Siddarth Nigam. “Nigam’s Scoring System for Acute Appendicitis With High Accuracy Surpassing Alvarado Scoring System”. International Surgery Journal 9, no. 4 (March 28, 2022): 835–840. Accessed February 20, 2026. https://www.ijsurgery.com/index.php/isj/article/view/8720.