References
- Frederickson D. S. Metabolic Basis of Inherited Disease, 3rd ed. McGraw Hill, New York 1966; 730, chapter 33
- Greenwald J. C., Fenton A. N. Medical, Surgical and Gynecologic Complications of Pregnancy, 2nd ed, J. J. Rovinsky, A. F. Guttmacher. The Williams and Wilkins Company, Baltimore 1965; 556, chapter 38
- Houlton M. C., Jackson M. B. Obstetrics and Gynecology 1978; 51(5)619