1. Experience with the induction of second-trimester abortion by extra-amniotic physical saline infusion: report of 127 cases;Blum;Eur J Obstet Gynaecol Reprod Biol,1980
2. Ripening a highly unfavourable cervix with extra-amniotic saline installation or vaginal prostaglandin E2 application;Schreyer;Obstet Gynecol,1989
3. A randomised trial of extra-amniotic saline infusion plus intracervical Foley catheter balloon versus prostaglandin E2 vaginal gel for ripening the cervix and inducing labor in patients with unfavourable cervices;Rouben;Obstet Gynecol,1993
4. A randomised trial of extra-amniotic saline infusion versus laminaria for cervical ripening;Lin;Obstet Gynecol,1995
5. Foley catheter under traction versus extra-amniotic prostaglandin gel in pre-treatment of unripe cervix - a randomised controlled trial;Mahomed;Cent Afr J Med,1988