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31. Protein nitrogen unit precipitation procedure for allergenic extracts: collaborative study. May JC, Sih JT, Best J, Douglas G, Rancour JM, Renker HR, Spingola F, Van Daele L, Zudeck S. J Assoc Off Anal Chem; 1981 Nov; 64(6):1435-8. PubMed ID: 7309663 [Abstract] [Full Text] [Related]
32. Enzymatic-ultraviolet method for measuring lactose in milk: collaborative study. Kleyn DH, Trout JR. J Assoc Off Anal Chem; 1984 Nov; 67(3):637-40. PubMed ID: 6430867 [Abstract] [Full Text] [Related]
35. Total nitrogen determination of various sample types: a comparison of the Hach, Kjeltec, and Kjeldahl methods. Watkins KL, Veum TL, Krause GF. J Assoc Off Anal Chem; 1987 Nov; 70(3):410-2. PubMed ID: 3610952 [Abstract] [Full Text] [Related]
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