Authors' reply

This publication has 4 references indexed in Scilit:

• The umbilical artery blood flow velocity waveform in relation to fetal breathing movements, fetal heart rate and fetal behavioural states in normal pregnancy at 37 to 39 weeks
  Early Human Development, 1986
• A comparison of Doppler ultrasound waveform indices in the umbilical artery—I. Indices derived from the maximum velocity waveform
  Ultrasound in Medicine & Biology, 1986
• Fetal central blood circulation in the third trimester of normal pregnancy - a longitudinal study. II. Aortic blood velocity waveform
  Early Human Development, 1986
• The blood flow velocity waveform in the fetal descending aorta: its relationship to fetal behavioural states in normal pregnancy at 37–38 weeks
  Early Human Development, 1985