Siregar, L., Loho, I. M., Waspodo, A. S., Rejeki, D. S., Firsyada, F., Swadari, R., … Siregar, M. I. (2020). Signet-Ring Cell Carcinoma of the Ampulla of Vater. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy, 19(2), 126–129. https://doi.org/10.24871/1922018126-129