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3. Doppler recordings of fetal movement: clinical correlation with real-time ultrasound;Besinger;Obstet. Gynecol.,1989
4. Robust locally weighted regression and smoothing scatterplots;Cleveland;J. Am. Stat. Assoc.,1979
5. Numerical analysis of the human fetal heart rate: modulation by breathing and movement;Dawes;Am. J. Obstet. Gynecol.,1981