1. Les ulceres du canal pylorique;Gutmann;Arch, mal. app. digest.,1935
2. Prepyloric ulcer and carcinoma;Sampson;Am. J. Roentgenol.,1939
3. The differential diagnosis of pyloric and prepyloric ulcerations;Doug;Am. J. Roentgenol.,1940
4. Ulcer of the pyloric sphincter;Horsley;Ann. Surg.,1936
5. Clinical picture of pyloric channel ulcer;Ruffin;J. A. M. A.,1955