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200 1 $aGeneral purpose technologies and economic growth$fedited by Elhanan Helpman
210   $aCambridge (Massachusetts)$aLondon$cThe Mit press$d1998c
215   $aVIII, 315 p.$cgraf. e tab.$d24 cm
610 1 $aCambiamento tecnologico:innovazione, ricerca, sviluppo
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