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Article 1: Human serum vitamin B12 assay methods — A review
Authos:David S.C. Lee , a, Bertram W. Griffithsa
Journal: Clinical Biochemistry
Volume 18, Issue 5, October 1985, Pages 261-266
doi:doi:

DOI:

http://dx.doi.org/10.1016/S0009-9120(85)80028-X

Article 2:Determination of metabolically active B12 and inactive B12 analog titers in human blood using several microbial reagents and a radiodilution assay.
Authos:H Baker, O Frank, F Khalil, B DeAngelis and S H Hutner
Journal: Journal of the American college of Nutrition
J Am Coll Nutr 1986 vol. 5 no. 5 467-475
Link:

Код: Выделить всё

http://www.jacn.org/content/5/5/467.abstract

Article 3: PROBLEMS WITH THE SERUM VITAMIN B12 ASSAY
Authos:J.M. England a, J.C. Linnell b
Journal: The Lancet,
Volume 316, Issue 8203, Pages 1072 - 1074, 15 November 1980
doi:

DOI:

http://dx.doi.org/10.1016/S0140-6736(80)92287-4

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1,3

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2 - off-line (only abstract)