1. Ultrasonographic determination of chorion type in twin gestation;Barss;Obstetrics and Gynecology,1985
2. A review of the pathologic anatomy of the human placenta;Benirschke;American Journal of Obstetrics and Gynecology,1962
3. Pathology of the Human Placenta;Benirsehke,1990
4. The twin-twin transfusion syndrome;Blickstein;Obstetrics and Gynecology,1990
5. The growth discordant twin;Blickstein;Obstetrics and Gynecology Survey,1988