SUR, B.; MISRA, S.; DASH, S. Evaluation of the anterior cervical angle of the uterus to predict spontaneous preterm birth. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 6, n. 6, p. 2323–2327, 2017. DOI: 10.18203/2320-1770.ijrcog20172114. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/2958. Acesso em: 4 oct. 2025.