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Beutner, S., Bloedom, B., Frixel, S., Blanco, L, Hoffmann, T., Martin, H., Mayer, B., Noack, P, Ruck, C., Schmidt, M., Schulke, L, Sell, S., Ernst, H., Haremza, S., Seybold, G., Sies, H., Stahl, W., and Walsh, R. 2001. Quantitative assessment of antioxidant properties of natural colorants and phytochemicals carotenoids, flavonoids, phenols and indigoids. The role of P- carotene in antioxidants functions, J. Sci. Food Agric., 81, 559. 

Beutner, S. et al. Quantitative assessment of antioxidant properties of natural colorants and phytochemicals carotenoids, flavonoids, phenols and indigoids the role of P-carotene in antioxidant functions, J. Set Food Agric., 81, 559,2001. 

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