GÜRBÜZ, Ahmet K.; ÖZEL, A. Melih. Elevated carbohydrate antigen 19-9 levels in a patient with choledocholithiasis. Turkish Journal of Gastroenterology, [S. l.], v. 13, n. 4, p. 213–215, 2002. Disponível em: https://www.turkjgastroenterol.org/index.php/tjg/article/view/1221. Acesso em: 1 jan. 2026.