1. American College of Obstetricians and Gynecologists June 1970
2. Demonstration of Rh antigens in a 38-day-old fetus;Bergström;Am. J. Obstet. Gynecol,1967
3. Rhesus sensitization in abortion;Gavin;Obstet. Gynecol,1972
4. Monroe County Health Department (Rochester, N.Y.) June 20, 1975