1. Influence of the rupture of membranes on compression of the fetal head during labor;Althabe,1969
2. Amniotomy and the course of labor;Friedman;Obstet. Gynec.,1963
3. The classification of fetal heart rate. II. A revised working classification;Hon;Conn. Med.,1967
4. Pressure exerted by uterine contractions on the head of the human fetus during labor;Schwarcz,1969
5. Schwarcz , R. L. et al. preliminary unpublished data