Classic pages in obstetrics and gynecology. On the mechanism of the expulsion of the placenta. James Matthews Duncan. Edinburgh Medical Journal, vol. 16 (part 1), pp. 899 to 903, 1871.
D005260:Female; D049672:History, 19th Century; D006801:Humans; D007743:Labor, Obstetric; D009774:Obstetrics / Q000266:history*; D010920:Placenta / Q000502:physiology; D011247:Pregnancy; D012606:Scotland