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Howes, M.-J. R., & Houghton, P. J. (2003). Plants used in Chinese and Indian traditional medicine for improvement of memory and cognitive function. Pharmacology Biochemistry and Behavior, 75(3), 513–527. doi:10.1016/s0091-3057(03)00128-x 
10.1016/s0091-3057(03)00128-x