00792nam0-22002771i-450-990003093360403321000309336FED01000309336(Aleph)000309336FED0100030933620000920d--------km-y0itay50------baitaITHow Trade Patterns and Technology Flows Affect Productivity GrowthWolfgang KellerWorking paper seriesNBER6990ProduttivitàH/2.112Keller,Wolfgang375429ITUNINARICAUNIMARCBK990003093360403321PaperSESSESHow trade patterns and technology flows affect productivity growth301805UNINAING01