TÜTÜN, U.; AKSÖYEK, A.; ULUS, A. T.; PARLAR, A. İhsan; GÖL, M. K.; BAYAZIT, M. Acute Gastrointestinal Bleeding Due to Primary Aortoduodenal Fistula: Report of Two Rare Cases. Turkish Journal of Gastroenterology 2004, 15, 253-257.