?url_ver=Z39.88-2004&rft_id=doi%3A+10.1086%2F423747&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Stefano&rft.aulast=Gattei&rft.au=Gattei%2C+Stefano&rft.date=2004&rft.title=Philosophy+of+Science&rft.atitle=Karl+Popper's+Philosophical+Breakthrough&rft.issue=4&rft.pages=pp.+448-466&rft.volume=71&rft.issn=0031-8248&rft.genre=article