1. Vitamin mineral supplementation and intelligence;Benton;Lancet,1990
2. Effect of vitamin and mineral supplementation on intelligence of a sample of school-children;Benton;Lancet,1988
3. Dictionary of nutrition;Bingham,1978
4. Nutritional status in the Royal Forest of Dean;Charley;Medical Officer,1952
5. Effect of vitamin and mineral supplementation on verbal & non-verbal reasoning of school-children;Crombie;Lancet,1990