00860nam0-22002891i-450-990003732240403321200010100-262-08263-2000373224FED01000373224(Aleph)000373224FED0100037322420000920d1998----km-y0itay50------baitay-------001yyGeneral purpose technologies and economic growth (edited by) E.HelpmanU.S.A.Massachusrtts Institute of technology1998315 p.25cmHelpman,Elhanan<1946- >128673ITUNINARICAUNIMARCBK990003732240403321O01.557640DECTSDECTSGeneral purpose technologies and economic growth (edited by) E.Helpman501070UNINAING01