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Perry, N.B., Klink, J.W.V., Burgess, E.J. and Parmenter, G.A. (1997) Alkamide Levels in Echinacea purpurea: A Rapid Analytical Method Revealing Differences among Roots, Rhizomes, Stems, Leaves and Flowers. Planta Medica, 63, 58-62. http://dx.doi.org/10.1055/s-2006-957605
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