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2.
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Losee, F.L., and Hess, W.C.: The Chemical Nature of the Proteins From Human Enamel, J. D. Res. 28: 512, 1949.
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Anderson, D.J. : Nitrogen in Human Dental Enamel, Biochem. J. 45: 31, 1949.
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Stack, M.V., and Williams, G.: Quantitative Variations in the Total Organic Matter of Enamel, Brit. D. J. 92: 261, 1952.
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Coolidge, T.R. : Nitrogen and Phosphorus of Early, Smooth-Surface Caries of Enamel, J. D. Res. 30: 97, 1951.
8.
Stack, M.V.: The Organic Content of "Chalky" Enamel, Brit. D. J. 96: 73, 1954.
9.
Needham, J., and Boell, E.J.: An Ultramicro-Kjeldahl Technique, Biochem. J. 33: 149, 1939.
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Russell, J.A. : The Colorimetric Estimation of Small Amounts of Ammonia by the Phenol-Hypochlorite Reaction, J. Biol. Chem . 156: 457, 1944.
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