1. A possible role for periconceptional multi-vitamin supplementation in the prevention of the recurrence of neural tube defects;Schorah,1991
2. Recommendations for the use of folic acid to reduce the number of cases of spina bifida and other neural tube defects;MMWR,1992
3. Evaluation of a new Recommended Dietary Allowance for folate;Bailey;J Am Diet Assoc,1992