Palliavite tratment of extrahepatic malign obstruction with plastic and metalic stents: a comparsion - YAŞA, M. Hadi; YURDAYDIN, C.; BAHAR, K.; KARAYALÇIN, S.; BEYLER, A.R.; ÖZKAN, H.; ÖRMECİ, N.; DÖKMECİ, A. (Turkish Journal of Gastroenterology, 1996)