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nih.gov
pubmed.ncbi.nlm.nih.gov
Luciano، M.؛ Posthuma، D.؛ Wright، M.؛ Degeus، E.؛ Smith، G.؛ Geffen، G.؛ Boomsma، D.؛ Martin، N. (2005). "Perceptual speed does not cause intelligence, and intelligence does not cause perceptual speed". Biological Psychology. ج. 70 ع. 1: 1–8. DOI:10.1016/j.biopsycho.2004.11.011. PMID:16038769.