?url_ver=Z39.88-2004&rft_id=10.1038%2Fnphys2575&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Battiston%2C+Stefano+&rft.aulast=Battiston&rft.aufirst=Stefano+&rft.issn=1745-2473&rft.issue=3&rft.pages=123-125&rft.volume=9&rft.date=March+2013&rft.atitle=Complex+derivatives&rft.title=Nature+Physics&rft.genre=article