?url_ver=Z39.88-2004&rft_id=10.1371%2Fjournal.pone.0045924&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Naroditskiy%2C+Victor&rft.aulast=Naroditskiy&rft.aufirst=Victor&rft.date=10+October+2012&rft.atitle=Verification+in+referral-based+crowdsourcing.+&rft.title=PLoS+ONE+&rft.genre=article