1. Protective effect of tryptophan on experimental phenylketonuria induced with phenylalanine + p-chlorophenylalanine in rats;Airaksinen;Med. Biol.,1975
2. Lowering brain phenylalanine levels by giving other large neutral amino acids;Andersen;Arch. Neurol. (Chic.),1976
3. The effects of dietary control on intelligence in phenylketonuria;Baumeister;Amer. J. Ment. Defic.,1967
4. Quantitative thin layer chromatography of amino acids;Berry,1973
5. New approaches to treatment of phenylketonuria;Berry,1977