Berry, H.K.: Paper chromatographic method for estimation of phenylalanine. Proc. Soc. Exp. Biol. Med.95: 71, 1957.
2.
Woolf, L.I.: Tests and Reagents in Phenylketonuria, F. L. Lyman, ed. Springfield. Illinois, Charles C Thomas, 1963, pp. 251-264.
3.
Prescott, B.A. , E. Borek, A. Brecher and H. Waelsch: Studies on oligophrenia phenylpyruvica. I. Microbiological determination of Land D-phenylalanine and of phenyllactic acid. J. Biol. Chem.181: 273, 1949.
4.
Moore, S., D.H. Spackman and W.H. Stein: Chromatography of amino acids on sulfonated polystyrene resins. An improved system. Anal. Chem.30: 1185, 1958.
5.
Undenfriend, S. and J.R. Cooper: Assay of L-phenylalanine as phenylethylamine after enzymatic decarboxylation: application to isotopic studies. J. Biol. Chem.203: 953, 1953.
6.
Kapeller-Adler, R.: Über eine neue Reaktion zur qualitativen und quantitativen Bestimmung des Phenylalanins. Biochem. Z.252: 185, 1932.
7.
Zalta, J.P. and Y. Khouvine: Dosage de la phenylalanine dans les hydrolysats proteiques. Bull. Soc. Chem. Biol.34: 937, 1952.
8.
McCaman, M.W. and E. Robins: Fluorometric method for the determination of phenylalanine in serum. J. Lab. Clin. Med.59: 885, 1962.
9.
Piez, K.A. and L. Morris: A modified procedure for the automatic analysis of amino acids. Anal. Biochem.1: 187, 1960.
10.
La Du, B.N. and P.J. Michael: An enzymatic spectrophotometric method for the determination of phenylalanine in blood. J. Lab. Clin. Med.55: 491, 1960.
11.
Guthrie, R. : A simple phenylalanine method for detecting phenylketonuria in large populations of newborn infants. Pediatrics32: 338, 1963.
12.
Summary of Meeting of Consultants to the California State Department of Health: Phenylketonuria and Guthrie inhibition assay screening procedure. Pediatrics32: 344, 1963.
13.
Scheel, C. and H. Berry: Comparison of serum phenylalanine levels with growth in Guthrie's inhibition assay in newborn infants. J. Pediat.61: 610, 1962.
14.
Arkin, H. and R.R. Colton: An Outline of Statistical Methods. New York, Barnes and Noble, 1950.
15.
Umbarger, B.: Phenylketonuria—Low Phenylalanine Diet. Institute on Nutrition Services in Mental Retardation Programs, U. S. Dept. of Health, Education and Welfare, 1963, pp. 38-42.
