Siregar, Lianda, Imelda M Loho, Agus Sudiro Waspodo, Dwi Sri Rejeki, Fajar Firsyada, Rahmanandika Swadari, Getty Inash Nandika, and Muhammad Iqbal Siregar. “Signet-Ring Cell Carcinoma of the Ampulla of Vater”. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy 19, no. 2 (July 21, 2020): 126–129. Accessed October 25, 2026. https://www.ina-jghe.com/index.php/jghe/article/view/672.