Samosir, David R.S., et al. “Esophageal Varices Bleeding in Portal Hypertension Due to Portal Vein and Splenic Vein Obstruction”. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy, vol. 3, no. 1, Jan. 2002, pp. 24-27, doi:10.24871/31200224-27.