1. Breech presentation;Hall;Am. J. Obstet. Gynecol,1956
2. An analysis of 16,327 breech births;Morgan;JAMA,1964
3. Abdominal versus vaginal delivery in breech presentation;Fischer-Rasmussen;Acta Obstet. Gynecol. Scand,1967
4. The perinatal mortality in breech deliveries and observations on affecting factors;Kauppila;Acta Obstet. Gynecol. Scand. (Suppl.),1975
5. Breech deliveries in private practice;Arnot;Am. J. Obstet. Gynecol,1952