1. 1. Berkeley Bonney, and McLeod , "The Abnormal in Obstetrics ." London: Arnold, 1938 , p. 236 .
2. Repeated secondary rupture of the pregnant uterus
3. 3. J. P. Greenhill , in an Editorial in the Year-book of Obstet. and Gynecol . Chicago, 1946 , p. 174 .
4. Obstetrics