Raveendran, S., Mohanapu, S., & Murugaiah, Y. (2017). Obstetric outcome in elderly nulliparous women: a comparative study. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 5(9), 2921–2928. https://doi.org/10.18203/2320-1770.ijrcog20162858