Obstetric clinical care : proceedings of the 1. European Congress of obstetric anaesthesia and analgesia held in Birmingham, U. K., 17-20 September, 1979 ; a forum for discussion between anaesthetists, Midwives, neonatologists and obstetricians - Crawford, J. S.; Weaver, J. B.; Wilday, R. J. (Amsterdam : Elsevier/North-Holland Biomechanical Press, New York Oxford., 1980)