1. The clinical significance of cardiotocography;Hammacher,1969
2. Diagnostic management of chronic placental insufficiency;Kubli,1969
3. Clinical experience with the oxytocin challenge test;Ray;Am J Obstet Gynecol,1972
4. A study of fetal heart rate acceleration patterns;Lee;Obstet Gynecol,1975
5. Fetal activity acceleration determination for the evaluation of fetal reserve;Lee;Obstet Gynecol,1976