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Perry, Ek; Pickering, At; Wang, Ww; Houghton, P; Perry, Ns (Winter 1998). «Medicinal plants and Alzheimer's disease: Integrating ethnobotanical and contemporary scientific evidence». Journal of alternative and complementary medicine (New York, N.Y.)4 (4): 419-28. ISSN1075-5535. PMID9884179. doi:10.1089/acm.1998.4.419.
Perry, Ek; Pickering, At; Wang, Ww; Houghton, P; Perry, Ns (Winter 1998). «Medicinal plants and Alzheimer's disease: Integrating ethnobotanical and contemporary scientific evidence». Journal of alternative and complementary medicine (New York, N.Y.)4 (4): 419-28. ISSN1075-5535. PMID9884179. doi:10.1089/acm.1998.4.419.