?url_ver=Z39.88-2004&rft_id=10.1140%2Fepjb%2Fe2007-00133-4&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Pammolli&rft.aufirst=Fabio&rft.au=Pammolli%2C+Fabio&rft.issn=1434-6028&rft.volume=57&rft.issue=2&rft.pages=127-130&rft.title=The+European+Physical+Journal+B&rft.atitle=A+generalized+preferential+attachment+model+for+business+firms+growth+rates%3A+I.+Empirical+evidence&rft.date=2007&rft.genre=article