Maekawa, H. et al. 2011. Signet-Ring Cell Carcinoma Co-Existing with Adenocarcinoma of the Ampulla of Vater. A Case Report. JOP. Journal of the Pancreas. 12, 2 (Mar. 2011), 162–166. DOI:https://doi.org/10.6092/1590-8577/3347.