?url_ver=Z39.88-2004&rft_id=doi%3A10.1371%2Fjournal.pone.0070726&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Matthieu&rft.aulast=Cristelli&rft.au=Cristelli%2C+Matthieu&rft.atitle=Measuring+the+intangibles%3A+a+metrics+for+the+economic+complexity+of+countries+and+products&rft.title=PloS+One&rft.date=August+2013&rft.issue=8&rft.volume=8&rft.pages=e70726&rft.issn=1932-6203&rft.genre=article