S. A. Jain and N. C. Chakravarti, “To compare the effects of intra vaginal prostaglandin E1 and intra-cervical prostaglandin E2 for prelabour ripening of unfavorable uterine cervix in nulliparous women”, Int J Reprod Contracept Obstet Gynecol, vol. 6, no. 8, pp. 3381–3386, Jul. 2017.