1. Bishop E H (1961) Isoxsuprine, a myometrical relacant. A preliminary report. Obstet Gynec 17: 422
2. Berg D E, Saling E (1972) The oxygen partial pressures of the human fetus during labor and delivery. In: Longo D L, Bartels H (eds) Respiratory Gas Exchange and Blood Flow in the Placenta. US Department of Health, Education and Welfare, Bethesda (Maryland)
3. Borell U, Fernström I, Ohlson L, Wiqvist N (1965) Influence of uterine contractions on the uteroplacental blood flow at term. Am J Obstet Gynec 93: 44
4. Harris F W S, Ramsey E M (1966) The morphology of human uteroplacental vasculature. Carn Instit Contrib Embryol 38: 43
5. Innes IR, Rickerson M (1965) Drugs acting on postganglionic adrenergic nerve endings and structures innervated by them (sympathicomimetic drugs). In: Goodman L S, Gilman A (eds) The Pharmacological Basis of Therapeutics. Macmillan, New York, p. 521