8Jackson M, Holmgren CM,Esplin MS,et al.Frequency of Fetal Heart Rate Categories and Short Term Neonatal Outcorne[J]. Obstet Gyneeol,2011,118(4) : 803-808.
10Dawes GS, Redman CW. Sonicaid System 8002 : Objective CTG analysis system user guide [J]. Oxford Instruments Medical System Division, Oxford, 1995, 19 (1): 47-51.