1. Current concepts in cardiology—systolic time intervals;Weissler;N. Engl. J. Med,1977
2. Systolic time intervals in the fetus and neonate;Goodlin;Obstet. Gynecol,1972
3. The pre-ejection period of the fetal heart: Patterns of change during labor;Organ;Am. J. Obstet. Gynecol,1974
4. Systolic time intervals of the fetal cardiac cycle;Murata;Obstet. Gynecol,1974
5. Continuous microfilm display of the electromechanical intervals of the cardiac cycle;Hon;Obstet. Gynecol,1974