1. An association between low maternal serum alphafetoprotein and fetal chromosomal abnormalities;Merkatz, I.R.; Nitowsky, H.M.; Macri, J.; Johnson, W.E.;Am J Obstet Gynecol,1984
2. Maternal serum alphafetoprotein measurement: a screening test for Down syndrome;Cuckle, H.S.; Wald, N.J.; Lindenbaum, R.H.;Lancet,1984
3. Prenatal screening for Down syndrome;Seller, M.J.;Lancet,1984
4. Prenatal screening for Down syndrome;Guibaud, S.; Bonnet-Capela, M.; Germain, D.; Dumont, M.; Thoulton, J.M.; Berland, M.;Lancet,1984
5. Low maternal serum AFP and Down syndrome;Tabor, A.; Norgaard-Pedersen, B.; Jacobsen, J.C.;Lancet,1984