1. ABC of labour care: physiology and management of normal labour;Steer;BMJ,1999
2. The forces of labor;Buhimschi;Fetal and Maternal Medicine Reviews,2003
3. On the contractions of the uterus throughout pregnancy: their physiological effects and their value in the diagnosis of pregnancy;Hicks;Transactions of the Obstetrical Society of London,1871
4. Beitrage zur Physiologischen Geburtskunde;Schatz;Archiv fur Gynakologie,1872