1. Human umbilical arterial and venous progesterone concentrations;Dawood;Amer. J. Obstet. Gynec.,1977
2. A study of progesterone concentration in maternal and fetal blood;Farquharson;Brit. J. Obstet. Gynaec.,1983
3. Concentration of progesterone in newborn and maternal circulations at delivery;Harbert;Obstet. and Gynec.,1963
4. Concentrations of sex hormones in umbilical cord blood: Their relationship to sex and birth order of infants;Maccoby;Child Develop.,1979
5. Umbilical cord plasma progesterone at term in relation to mode of delivery;Maynard;Brit. J. Obstet. Gynaec.,1980