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Roquebert J, Demichel P (October 1984). “Inhibition of the alpha 1 and alpha 2-adrenoceptor-mediated pressor response in pithed rats by raubasine, tetrahydroalstonine and akuammigine”. European Journal of Pharmacology106 (1): 203-5. doi:10.1016/0014-2999(84)90698-8. PMID6099269.