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Total Protein Nitrogen: Evaluation and Comparison of Four Different Methods

C. Gehrke, L. L. Wall, T. E. Neuner, 1975 .

Comparison of Kjeldahl Method for Determination of Crude Protein in Cereal Grains and Oilseeds with Generic Combustion Method: Collaborative Study

Ronald C Bicsak, R Boles, R Cathey, 1993 .

Pollution-reduced Kjeldahl method for crude protein.

R. Cathey, P. R. Rexroad, 1976, Journal - Association of Official Analytical Chemists.