Tenda, E.D. et al. 2010. Papilla Vaterƒs Tumor in Elderly: an Interdisciplinary Issue. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy. 11, 3 (Jan. 2010), 155–159. DOI:https://doi.org/10.24871/1132010155-159.