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J. Speek, C. R. Temalilwa and J. Schrijver
Determination of β-carotene content and vitamin A activity of vegetables by high-performance liquid chromatography and spectrophotometry
Food Chemistry, Volume 19, Issue 1, 1986, Pages 65-74

DOI:

http://dx.doi.org/10.1016/0308-8146(86)90128-7

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