1. Althabe O, Aramburu G, Schwarcz RL, et al: Influence of the rupture of membranes on compression of the fetal head during labor, in Perinatal Factors Affecting Human Development. Washington, DC, Pan American Health Organization Scientific Publication 185, 1969, pp 143–149.
2. Bissonnette JM: Relationship between continuous FHR patterns and Apgar score in the new born. Br J Obstet Gynaecol 82: 24, 1975.
3. Brady JP, James LS, Baker MA: Heart rate changes in the fetus and newborn during labor, delivery and immediate neonatal period. Am J Obstet Gynecol 84: 1, 1962.
4. Caldeyro-Barcia R, Mendez-Bauer C, Poseiro JJ, et al: Control of human fetal heart rate during labor, in Cassels DE (ed): The Heart and Circulation of the Newborn and Infant. New York, Grune & Stratton, 1966, pp 7–36.
5. Caldeyro-Barcia R, Mendez-Bauer C, Poseiro JJ, et al: Fetal monitoring in labor, in Wallace HM, Gold EM, Lis EF (eds): Maternal and Child Health Practices. Springfield, 111, Thomas, 1973, pp 332–394.