1. Fluhmann, C. F.: The Management of Menstrual Disorders. Philadelphia, W. B. Saunders Company, 1956, chap. 8.
2. Some Observations on the Etiology of Dysfunctional Uterine Bleeding
3. Novak, E. and Novak, E.: Textbook of Gynecology. Baltimore, The Williams & Wilkins Company, 1956, chap. 44.