M. A. Khalifa, A. M. Abbas, M. A. Gaber, and M. Salah, “Bishop score versus transvaginal ultrasonographic measurement of cervical length in predicting successful labor induction in post-term pregnancy: prospective cohort study”, Int J Reprod Contracept Obstet Gynecol, vol. 7, no. 11, pp. 4646–4651, Oct. 2018.