N. OKÇU, M. D. ONUK, E. AKARSU, M. GÜNDOĞDU, C. GÜNDOĞDU, and T. BURAN, “FREQUENCY OF GASTRIC CANCER, ENDOSCOPICAL AND HISTOLOGICAL- FEATURES IN ERZURUM REGION”, Turkish Journal of Gastroenterology, vol. 5, no. 2, pp. 263–266, Jan. 1994.