1. Uterine cervix and isthmus under normal and pathological conditions;Asplund;Acta Radiologica Scandinavica,1952
2. Influence of a partograph on the active management of labour;Beazley;Lancet,1972
3. Dilatation of the non-pregnant cervix;Black;Journal of Obstetrics and Gynaecology of the British Commonwealth,1974
4. Vibration of the cervix in labour;Brandt;Journal of Obstetrics and Gynaecology of the British Commonwealth,1974
5. Reduction of foetal trauma during labour with the aid of low frequency vibrations;Dahlgren,1972