?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=P.&rft.au=Aghion%2C+P.&rft.aulast=Aghion&rft.pages=265-276&rft.atitle=Entry+and+productivity+growth%3A+evidence+from+microlevel+panel+data&rft.volume=2&rft.title=Journal+of+the+European+Economic+Association&rft.date=April+2004&rft.issn=1542-4766&rft.issue=2-3&rft.genre=article