VERMA, P.; SINGH, K. N.; GHANGHORIYA, V. To study analyze maternal serum alpha-fetoprotein as a biomarker of placental adherence in low lying placenta. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 5, n. 6, p. 1959–1963, 2017. DOI: 10.18203/2320-1770.ijrcog20161698. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/1260. Acesso em: 4 dec. 2025.