1. Variations in hyperphenylalanine;Allen,1967
2. Evaluation studies resulting in the standardization of the bacterial inhibition assay for blood phenylalanine;Ambrose;Health Lab. Sci.,1969
3. Report on a cooperative study of various fluorometric procedures and the Guthrie bacterial inhibition assay in the determination of hyperphenylalaninemia;Ambrose;Health Lab. Sci.,1973
4. Causes for phenylalanine with normal tyrosine in newborn screening programs;Berman;Amer. J. Dis. Child.,1969
5. Follow-up screening for phenylketonuria;Buist;N. Engl. J. Med.,1974