?url_ver=Z39.88-2004&rft_id=10.1038%2Fsrep00723&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Tacchella%2C+Andrea&rft.aulast=Tacchella&rft.aufirst=Andrea&rft.date=October+2012&rft.title=Scientific+Reports&rft.atitle=A+New+Metrics+for+Countries'+Fitness+and+Products'+Complexity&rft.volume=2&rft.issn=2045-2322&rft.genre=article