Comparison of kjeldahl and dumas methods for determining protein contents of soybean products
S. Jung, D. A. Rickert, N. A. Deak, E. D. Aldin, J. Recknor, L. A. Johnson and P. A. Murphy
Journal of the American Oil Chemists' Society Volume 80, Number 12, 1169-1173
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http://dx.doi.org/10.1007/s11746-003-0837-3