1. Universa medicina 1554;Fernel,1932
2. Acute appendicitis in university students: A twenty year study of 1,028 cases;Ferrier;Am Coll Health Assoc J,1972
3. Chronic and recurrent appendicitis;Savrin;Am J Surg,1979
4. Chronic appendicitis;Grossmann;Surg Gynecol Obstet,1978
5. X-ray diagnosis of enteroliths in the appendix;Weisflog;Fortscr Geb Rontgenstr,1906