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Burris, R.H. , and Wilson, P.W.: Measures of Respiratory Activity With Resting Cells, Proc. Soc. Exper. Biol. & Med. 45: 721, 1939.
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Campbell, W.R. , and Hanna, M.I.: The Determination of Nitrogen by Modified Kjeldahl Methods, J. Biol. Chem. 119: 1, 1937.
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Meeker, E., and Wagner, E.C.: Titration of Ammonia in Presence of Boric Acid, Indust. & Engin. Chem. (Analyt. Ed.)5: 396, 1933.
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Sobel, A.E., Meyer, A.M., and Gottfried, S.P.: A Convenient Titrometric Ultramicromethod for the Estimation of Urea and Kjeldahl Nitrogen, J. Biol. Chem. 156: 355, 1944.
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Hawk, P.B., and Bergeim, 0.: Practical Physiological Chemistry, ed. 11, Philadelphia, 1937, P. Blakiston's Son & Co., p. 707.
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Beatty, C., III: Anhydrous Copper Sulfate in the Kjeldahl Nitrogen Determinations, Indust . & Engin. Chem. (Analyt. Ed.)15: 476, 1943.
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