1. A review of undergraduate teaching on major trauma and cardiopulmonarv resuscitation: (data from 74 medical schools in 22 countries);Hoffman, E.;Re scitation,1973
2. Vacuum versus forceps;Cavenagh, A.J.M.;Lancet,1984
3. Vacuum extractor;Kappy, K.A.;Clin Penrnatol
4. Munro Kerr's Operative Obstetrics;Myerscough, PR,1982
5. Evaluation of CPR performances among medical students, residents and attendings at Mount Sinai School of Medicine. MtSinaiJ Med 1981; 48: 89-94. in some hospitals it is used about once a week, and since British obstetricians have now been using it in the Third World for use of the ventouse or vacuum extractor to help in child birth;Nelson, M.