1. Congenital malformation of the central nervous system;Bradshaw, J.; Weale, J.; Weatherall, J.;Population Trends,1980
2. Prevention and prenatal diagnosis of neural tube defects;Laurence, K.M.
3. Congenital malformations of the central nervous system;Record, R.G.; McKeown, T.;I. Survey of,1949
4. The major central nervous system malformations in South Wales. II. Pregnancy factors, seasonal variations and social class effects;Laurence, K.M.; Carter, C.O.; David, P.A.;British Journal of Preventive and Social Medicine,1968
5. Nutritional deficiencies and neural tube defects;Smithells, R.W.; Sheppard, S.; Schorah, C.J.;Arch Dis Child,1976