1. Centers for Disease Control. Valproate: a new cause of birth defects-report from Italy and follow up from France,1983
2. The apparently declining prevalence of neural tube defect in two counties in south Wales over three decades illustrating the need for continuing action and vigilance;Laurence, K.;Z Kinderchir,1985
3. Spina bifida-a vanishing nightmare?;Lorber, J.; Ward, A.;Arch Dis Child,1985
4. Unanswered questions on neural tube defects;Seller, M.;Br Med J,1987
5. Prenatal diagnosis of four cases of spina bifida in mothers treated with valproate;Guibaud, S.;Genet Hum,1987