?url_ver=Z39.88-2004&rft_id=10.1038%2Fsrep02729&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Squartini%2C+Tiziano&rft.aufirst=Tiziano&rft.aulast=Squartini&rft.date=2013&rft.atitle=Reciprocity+of+weighted+networks&rft.title=Scientific+Reports&rft.issue=2729&rft.volume=3&rft.issn=2045-2322&rft.genre=article