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* Johnson M. [http://clematis.sunstone.se/img/p_89-90.pdf The Genus Clematis pp 89-90, 2001]
* [http://www.swsbm.com/AJP/AJP_1898_No_10.pdf Monroe WR. Analysis of the rhizome of ''Aralia californica'']. ''American Journal of Pharmacy'' vol. '''70''' Nº 10,
* [http://www.innvista.com/health/herbs/echinace.htm, sitio Echinaceae]
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