BrockD. J. H.BoltonA. E.ScrimgeourJ. B. (1974). Prenatal diagnosis of spina bifida and anencephaly through maternal plasma-alpha- fetoprotein measurement. Lancet, 1, 767
2.
Lancet (1974). Leading article. Towards the prevention of spina bifida. Lancet, 1, 907
3.
LaurenceK. M., (1974). Fetal malformations and abnormalities. Lancet, 2, 939