SINGH, P.; SAIYDA, H. Sildenafil citrate and uteroplacental perfusion in fetal growth restriction. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, [S. l.], v. 7, n. 12, p. 5116–5124, 2018. DOI: 10.18203/2320-1770.ijrcog20184978. Disponível em: https://www.ijrcog.org/index.php/ijrcog/article/view/5759. Acesso em: 27 oct. 2025.