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2. Management of breech presentation at term;Rovinsky;Am. J. Obstet. Gynecol.,1973
3. Kauppilla, O.: The perinatal mortality in breech deliveries and observations on affecting factors. A retrospective study of 2.227 cases, Acta Obstet. Gynecol. Scand. (Suppl. 39).
4. Breech presentation and perinatal mortality;Hall;Am. J. Obstet. Gynecol.,1965
5. The characteristics and perils of breech presentation;Brenner;Am. J. Obstet. Gynecol.,1974