SINGH, S.; SINGH, P. Effect of first trimester maternal serum pregnancy associated plasma protein: a level on fetomaternal outcome. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 9, n. 1, p. 87–93, 2019. DOI: 10.18203/2320-1770.ijrcog20196002. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/7269. Acesso em: 4 dec. 2025.