?url_ver=Z39.88-2004&rft_id=10.1016%2Fj.chaos.2009.03.150&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Alberto&rft.au=Carpinteri%2C+Alberto&rft.aulast=Carpinteri&rft.issn=0960-0779&rft.volume=42&rft.atitle=A+top-down+approach+for+the+prediction+of+hardness+and+toughness+of+hierarchical+materials+&rft.pages=2546+-+2552&rft.issue=4&rft.title=Chaos%2C+Solitons+and+Fractals&rft.date=2009&rft.genre=article