1. T. L. Tio, M.H. Schouwink, R. J. L.M. Cikot, G. N. J. Tytgat. Preoperative TNM Clasification of Gastric Carcinoma by Endosconography in Comparison with the Pathological TNM System. A Prospective Study of 72 Cases. Hepato-gastroentrol. 1989:36:51-6.