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Yaron, Y., Cherry, M., Kramer, R.L., O’Brien, J.E., Hallak, M., Johnson, M.P. and Evans, M.I. (1999) Second-Trimester Maternal Serum Marker Screening: Maternal Serum α-Fetoprotein, β-Human Chorionic Gonadotropin, Estriol, and Their Various Combinations as Predictors of Pregnancy Outcome. American Journal of Obstetrics & Gynecology, 181, 968-974.
http://dx.doi.org/10.1016/S0002-9378(99)70334-0

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