TY  - BOOK
TI  - Obstetrics and gynecology clinics of North America: ultrasound in obstetrics [March 2004, Voulume 31, number 1] 
SN  - 0889-8545
U1  - 618.207543 
PY  - 2004///
CY  - London
PB  - Saunders
ER  -