Taechakraichana, N., U. Jaisamrarn, Y. Tannirandorn, P. Trivijitsilp, and W. Termrungruanglert. “Prostaglandin E2 Vaginal Suppository for Induction of Labour in Favourable and Unfavourable Cervix”. Thai Journal of Obstetrics and Gynaecology, vol. 8, no. 2, Apr. 1996, pp. 87-92, https://he02.tci-thaijo.org/index.php/tjog/article/view/257689.