SHARMA, P.; MAHESHWARI, S.; BARALA, S. Correlation between second trimester beta human chorionic gonadotropin levels and pregnancy outcome in high risk group. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 5, n. 7, p. 2358–2361, 2017. DOI: 10.18203/2320-1770.ijrcog20162127. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/1405. Acesso em: 7 oct. 2025.