8MARCO A,RUBIO R,COMPANO R,et al. Comparison of the Kjel- dahl method and a combustion method for total nitrogen determiation in animal feed [ J]. Talanta,2002,57 (5) : 1019 -1026.
9KAMIZAKE N K K,GONCALVES M M,ZAIA CASSIA T B V,et al. Determination of total proteins in cow milk powder samples: a comparative study between the Kjeldahl method and spectrophot- ometric methods[ J ]. J Food Composition Analysis,2003,16 (4) : 507 -516.
10THOMPSON M, OWEN L, WILKINSON K, et al. Testing for bias between the Kjeldahl and Dumas methods for the determination of nitrogen in meat mixtures, by using date form a designed interlabo- ratory experiment[J]. Meat Sci,2004,68 (4) : 631 - 634.
