Gama, B. N., C. C. Rodrigues, B. D.Couto, F. M. Martins, I. Rosa, N. Rosa, and M. Rosa. “Gallstone Ileus: A Rare Cause of Intestinal Obstruction”. International Surgery Journal, vol. 12, no. 1, Dec. 2024, pp. 97-101, doi:10.18203/2349-2902.isj20243991.