GÜLŞEN, M. (1994) “CARCINOEMBRYONIC ANTIGEN (CEA) LEVELS IN BLOOD SERUM AND GASTRIC JUICE IN BENIGN AND MALIGNANT GASTRIC LESIONS”., Turkish Journal of Gastroenterology, 5(1), pp. 68–71. Available at: https://www.turkjgastroenterol.org/index.php/tjg/article/view/392 (Accessed: 1 January 2026).