GÜRBÜZ, Ahmet K., and A. Melih ÖZEL. “Elevated Carbohydrate Antigen 19-9 Levels in a Patient With Choledocholithiasis”. Turkish Journal of Gastroenterology 13, no. 4 (January 4, 2002): 213–215. Accessed January 1, 2026. https://turkjgastroenterol.org/index.php/tjg/article/view/1221.