OKÇU, Nihat; UYANIK, Bekir SAMİ; AKARSU, Ersin; BAKAN, Ebubekir; TONBUL, H. Zeki. The importance of carbonhydrate antigens (CA 19-9, CA 125), carcinoembriyonic antigen (CEA) and alkaline phosphatase (AP) in patients with gastric and colorectal cancer. Turkish Journal of Gastroenterology, [S. l.], v. 6, n. 4, p. 467–471, 1995. Disponível em: https://www.turkjgastroenterol.org/index.php/tjg/article/view/671. Acesso em: 1 jan. 2026.