1. Perinatal asphyxia;Adamsons;Pediatr Clin North Am,1973
2. Foetal heart frequency and perinatal condition of the foetus and newborn;Hammacher;Gynecologia (Basel),1968
3. An introduction to fetal heart rate monitoring;Hon,1975
4. Fetal heart rate monitoring;Freeman,1981
5. Inconsistencies in clinical decisions in obstetrics;Barrett;Lancet,1990