?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Stefano&rft.aulast=Gattei&rft.au=Gattei%2C+Stefano&rft.tpages=160&rft.date=1997&rft.isbn=9788886918077&rft.btitle=Karl+Popper+1902-1994&rft.genre=book