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Byrdwell WC, Devries J, Exler J, et al. 2008

Analyzing vitamin D in foods and supplements: methodologic challenges., Am J Clin Nutr 88: 554S-557S
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Horst RL, Reinhardt TA, Russell JR, Napoli JL, 1984

The isolation and identification of vitamin D2 and vitamin D3 from Medicago sativa (alfalfa plant)., Arch Biochem Biophys 231: 67-71
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