1. Recommended Dietary Allowances,1989
2. The correlation of the amino-acid composition of proteins with their nutritive value;Block;Nutr Abstr Rev.,1946
3. Recommended Dietary Allowances,1980
4. Comparison of tryptophan assays for food proteins;Friedman,1984
5. Hydrolysis of proteins with p-toluenesulfonic acid—determination of tryptophan;Liu;J Biol Chem.,1971