?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Stein%2C+Sebastian&rft.aulast=Stein&rft.aufirst=Sebastian&rft.issue=14&rft.volume=175&rft.date=September+2011&rft.atitle=Algorithms+and+mechanisms+for+procuring+services+with+uncertain+durations+using+redundancy+&rft.title=Artificial+Intelligence&rft.pages=2021-2060&rft.genre=article