1. Safety of diagnostic ultrasound in obstetrics;Hellman;Lancet,1970
2. Safety studies with ultrasonic Doppler technic;Bernstein;Obstet. Gynecol,1969
3. The safety of clinical ultrasonic examination;Kohorn;Obstet. Gynecol,1967
4. Postnatal sequelae of ultrasound exposure at fifteen days of gestation in the rat;Sikov,1976
5. An experimental study on the effect of low intensity ultrasound on developing mouse embryos;Shohi;Teratology,1976