1. ‘Amniotic fluid alpha-fetoprotein in the antenatal diagnosis of spina biflda.’;Allan;Lancet,1973
2. ‘Early prenatal diagnosis of anencephaly.’;Brock;Lancet,1972
3. ‘Alpha-fetoprotein in the antenatal diagnosis of anencephaly and spina bifida.’;Allan;Lancet,1972
4. ‘Prenatal diagnosis of anencephaly through maternal serum alpha-fetoprotein measurement.’;Allan;Lancet,1973
5. ‘Prenatal diagnosis of spina bifida and anencephaly through maternal plasma alpha-fetoprotein measuiement.’;Allan;Lancet,1974