1. Pelvic scoring for elective induction;Bishop;Obstet. Gynec.,1964
2. Calder, A.A. The influence of cervical state on the outcome of labour induced by amniotomy and intravenous oxytocin, Brit. J. Obstet. Gynaec. (in press)
3. Calder, A.A., M.P. Embrey and T. Tait. Cervical ripening with prostaglandin E2 in viscous gel prior to labour induction, Brit. J. Obstet. Gynaec. (in press)
4. Prostaglandin therapy for cervical ripening prior to induction of labour;Calder,1976
5. Extra-amniotic prostaglandin E2 and the unfavourable cervix;Shepherd;Lancet,1976