1. Lumbar epidural block in labour: a clinical analysis;Crawford, J.S.;BrJAnaesth,1972
2. The second thousand epidural blocks in an obstetric hospital practice;Crawford, J.S.;BrJAnaesth,1972
3. A three-year survey of an obstetric epidural service with top-up doses administered by midwives;Brownridge, P.;Anaesth Intensive Care,1982
4. Obstetrical anaesthesia at Winnipeg Women's Hospital 1975-83: anaesthetic techniques and complications;Ong, B.; Cohen, M.M.; Cumming, M.; Palahniuk, R.J.;CanJAnaesth,1987
5. Unintentional dural puncture. A survey of recognition and management;Okell, R.W.;Anaesthesia,1987