Syam, A. F.; Abdullah, M.; Makmun, D.; Simadibrata, M.; Djojoningrat, D.; Manan, C.; Rani, A. A.; Daldiyono, D. The Causes of Upper Gastrointestinal Bleeding in the National Referral Hospital: Evaluation on Upper Gastrointestinal Tract Endoscopic Result in Five Years Period. InaJGHE 2005, 6, 71-74.