1. Routine ultrasound examination in pregnancy;of Obstetricians, Royal College; Party, Gynaecologists Working,1984
2. Die Rolle der Ultraschalldiagnostik bei der Erkennung fetaler Gefahrenzustande;Hackelorer, B.J.,1981
3. The use of ultrasound examination, intrapartum fetal heart rate monitoring and betamimetic drugs in France;Blondel, B.; Ringa, V.; Breart, G.;Br J Obstet Gynaecol,1989
4. US Preventive Services Task Force. Guide to clinical preventive services,1989
5. Routine ultrasound screening for the prediction of gestational age;Campell, S.; Warsof, S.L.; Little, D.; Cooper, D.J.;Obstet Gynecol,1985