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Lua i Stíl Chicago (17ú heag.)Park, S., J. Coull, R. McShane, A. Young, B. Sahakian, T. Robbins, agus P. Cowen. Tryptophan Depletion in Normal Volunteers Produces Selective Impairments in Learning and Memory. 1994.
Lua MLA (9ú heag.)Park, S., et al. Tryptophan Depletion in Normal Volunteers Produces Selective Impairments in Learning and Memory. 1994.
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