?url_ver=Z39.88-2004&rft_id=10.1007%2FBF02906877&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Marchetti%2C+C.&rft.aulast=Marchetti&rft.aufirst=C.&rft.issue=1-2&rft.volume=18&rft.date=January+2003&rft.issn=0393-9375&rft.atitle=On+energy+systems+historically+and+perspectively&rft.title=Human+Evolution&rft.pages=83-95&rft.genre=article