?url_ver=Z39.88-2004&rft_id=10.1371%2Fjournal.pone.0047278&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Caldarelli&rft.au=Caldarelli%2C+Guido&rft.aufirst=Guido&rft.pages=e47278&rft.issn=1932-6203&rft.title=PloS+One&rft.issue=10&rft.volume=7&rft.date=October+2012&rft.atitle=A+Network+Analysis+of+Countries%E2%80%99+Export+Flows%3A+Firm+Grounds+for+the+Building+Blocks+of+the+Economy&rft.genre=article