1. Caldeyro-Barcia, R. and Sereno, J. A. (1961). The response of the human uterus to oxytocin throughout pregnancy. In Caldeyro-Barcia, R. and Heller, H. (eds.) Oxytocin. pp. 177–200. (Oxford: Pergamon Press).
2. Smyth, C. N. (1958). Uterine irritability. Lancet, 1, 237–9.
3. Embrey, M.P. and Anselmo, J. F. (1962). The effects of intravenous oxytocin on uterine contractility. J. Obstet. Gynaecol. Br. Commonw., 69, 918–23.
4. Anderson, A.B. M. and Turnbull, A.C. (1969). Relationship between length of gestation and cervical dilatation, uterine contractility, and other factors during pregnancy. Am. J. Obstet. Gynecol., 105, 1207–14.
5. Hendricks, C. H., Brenner, W.E. and Kraus, G. (1970). Normal cervical dilatation pattern in late pregnancy and labor. Am. J. Obstet. Gynecol., 106, 1065–80.