Acharya, Metesh, Nikolaos Panagiotopoulos, Patrizia Cohen, Raida Ahmad, and Long Jiao. “Poorly-Differentiated Signet-Ring Cell Carcinoma of the Ampulla of Vater: Report of a Rare Malignancy”. JOP. Journal of the Pancreas 14, no. 2 (March 10, 2013): 190-194. Accessed July 3, 2025. http://www.serena.unina.it/index.php/jop/article/view/1267.