?url_ver=Z39.88-2004&rft_id=10.1073%2Fpnas.0509543102+&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Pammolli%2C+Fabio&rft.aulast=Pammolli&rft.aufirst=Fabio&rft.issue=52&rft.pages=18801-18806&rft.volume=102&rft.date=2005&rft.title=Proceedings+of+the+National+Academy+of+Sciences&rft.atitle=The+growth+of+business+firms%3A+Theoretical+framework+and+empirical+evidence&rft.issn=1091-6490&rft.genre=article