1. RIPENING OF THE CERVIX WITH EXTRA-AMNIOTIC PROSTAGLANDIN E2 IN VISCOUS GEL BEFORE INDUCTION OF LABOUR
2. M. P. Embrey (1975 ): The Prostaglandins in Human Reproduction , Churchill Livingstone, Edinburgh, p24 .
3. R. J. Fitzpatrick, and J. Knight (1977 ): Ciba Foundation Symposiunz No. 47 . Elsevier/Excerpta Medica, Amsterdam, p31 .
4. The connective tissue ground substance in the mouse uterine cervix: An electron microscopic histochemical study
5. G. C. Liggins, and J. Knight (1977 ): Ciba Foundation Symposium No 47 . Elsevier/Excerpta Medica, Amsterdam, p41 .