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200 1 $aDetecting technological catch-up in economic convergence$fFrancesco Pigliaru
210   $a[S.l.$cs.n.]$d1999
225 1 $aContributi di ricerca$fCRENoS, Centro ricerche economiche Nord Sud, Università degli studi di Cagliari$v99/2
610 0 $aInnovazioni tecnologiche$aAspetti economici
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