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2. Abdominal versus vaginal delivery in breech presentation;Fischer-Rasmussen;Acta obstet. gynec. scand.,1967
3. Management of breech presentation at term;Rovinsky;Am. J. Obstet. Gynec.,1973
4. An Evaluation of Caesarean Section in the United States;Marieskind,1979
5. Breech presentation and perinatal mortality;Hall;Am. J. Obstet. Gynec.,1965