1. Prenatal screening for anencephaly-spina bifida: Some epidemiologic projections for a national program;Goldberg,1979
2. Racial variations in the incidence of congenital malformations;Erickson;Ann. Hum Genet,1976
3. Congenital Malformations Surveillance Report;Centers for Disease Control,1979
4. Survival and handicap of infants with spina bifida;Althouse;Arch. Dis. Child,1980
5. Workgroup Paper: The interpretation of AFP values and the effect of AFP assay performance on screening efficacy;Wald,1980