NIGAM, V. K.; NIGAM, S. Nigam’s scoring system for acute appendicitis with high accuracy surpassing Alvarado scoring system. International Surgery Journal, [S. l.], v. 9, n. 4, p. 835–840, 2022. DOI: 10.18203/2349-2902.isj20220943. Disponível em: https://www.ijsurgery.com/index.php/isj/article/view/8720. Acesso em: 21 jun. 2025.