TIWARI, A.; CHANDNANI, K. A study to evaluate gestational age with the help of placental thickness. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 2, n. 4, p. 503–505, 2016. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/230. Acesso em: 9 oct. 2025.