1. Hazards of Twin Pregnancies
2. Delivery of breech first twins: a multicenter retrospective study;Blickstein;Obstet Gynecol,2000
3. Birth Hazard of the Second Twin
4. A paired controlled study of vaginal and abdominal delivery of the low birth weight breech fetus;Duenmoelter;Obstet Gynecol,1979
5. Management of the nonvertex second twin;Wells;Surg Gynecol Obstet,1991