1. Phenylketonuria and hyperphenylalaninemia;Tourian,1983
2. Hyperphenylalaninemia: diagnosis and classification of the various types of phenylalanine hydroxylase deficiency in childhood;Güttier;Acta Paediatr Scand [Suppl],1980
3. Diagnosis of phenylalanine hydroxylase deficiency (phenylketonuria);Berry;Am J Dis Child,1982
4. Serum tyrosine within the first hour after an oral load of phenylalanine;Güttler;Scand J Clin Lab Invest,1977
5. The diagnosis of phenylketonuria;O'Flynn;Am J Dis Child,1980