1) Kivilaakso, E., Barzilai, A., Schissel, R., Crass, R. and Silen, W.: Ulceration of isolated amphibian gastric mucosa., Gastroenterology, 77: 31-37, 1979.
2) Davenport, H. W., Warner, H. A. and Code, C. F.: Functional significance of gastric mucosal barrier to sodium., Gastroenterology, 47 : 142-152, 1964.
5) Sun D. C. H.: Etiology and pathology of peptic ulcer, Gastroenterology (3rd ed.) 579-610, ed. by Bockus, H. L. W. B. Saunders Co. Philadelphia, London, Tronto, 1974.