1. Rehfuss, M. E.: Diseases of the Stomach, Management and Treatment. W. B. Saunders, p. 448, 1927.
2. Rosenow, E. C.:J. Am. Med. Assn., 61, 1947, 1913.Ibid., 60, 1687, 1915.
3. Haden, R. L. and Bohan, P. T.:J. Am. Med. Assn., 84, 409, 1925.
4. Hurst, A. F. and Stewart, M. J.: Gastric and Duodenal Ulcer. Oxford University Press, p. 424, 1929.
5. Eusterman, G. B. and Balfour, D. G.: The Stomach and Duodenum. W. B. Saunders, p. 768. 1936.