NOOLA, G. S.; C. R., S. A clinical study of duodenal ulcer perforation. International Surgery Journal, [S. l.], v. 3, n. 2, p. 711–713, 2016. DOI: 10.18203/2349-2902.isj20160457. Disponível em: https://www.ijsurgery.com/index.php/isj/article/view/64. Acesso em: 31 jan. 2026.