Oterdoom, Leendert H., Stijn J.B. van Weyenberg, and Nanne K.H. de Boer. “Double-Duct Sign: Do Not Forget the Gallstones”. Journal of Gastrointestinal and Liver Diseases 22, no. 4 (December 1, 2013): 447–450. Accessed April 21, 2026. https://jgld.ro/jgld/index.php/jgld/article/view/2013.4.14.