1. The human fetal circulation in normal labor;Hon,1966
2. Control of the human fetal heart rate during labor;Caldeyro-Barcia,1966
3. The diagnosis of fetal distress with an electronic fetal heart monitor;Hammacher,1967
4. Observations on “pathologic” fetal bradycardia;Hon;Am J Obstet Gynecol,1959
5. Foetal heart frequency and perinatal condition of the foetus and newborn;Hammacher;Gynaecologia,1968