1. Tsuzaki T, Sekijima K, Maeda K, et al. The survey on the perinatal variables and the incidence of cerebral palsy for 12 years before and after the application of the fetal monitoring system. Acta Obstet Ginecol jpn. 1990;42:99-105.
2. Cerebral palsy in Tottori, Japan;Takeshita;Neuroepidemiology,1989
3. Hon EH. An Atlas of Fetal Heart Rate Pattern. New Haven: Harty Press. 1968.
4. Umezawa J. Studies on the relation between heart rate and PaO2 in hypoxic rabbit: a comparative study for fetal heart rate change in labor. Acta Obstet Gynecol Jpn. 1975;28:1203-12.
5. Maeda K, Kimura S, Nakano H, et al. Pathophyaiology of Fetus. Fukuoka: Fukuoka Printing; 1969.