SOMU, K.; S., S. B.; HEBBAR, S.; G., S.; PAI, M. V. Sonographic assessment of fetal head deflexion using occiput: spine angle measured during first stage of labour and its role in predicting the mode of delivery among nulliparous women. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 8, n. 8, p. 3025–3030, 2019. DOI: 10.18203/2320-1770.ijrcog20193147. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/6986. Acesso em: 4 dec. 2025.