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*035  $a(EXLNZ-47BIBSYS_NETWORK)990220291924702201
*035  $a(NO-LaBS)14038063(bibid)
*035  $a(NO-TrBIB)022029192
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*040  $aNO-TrBIB$bnob$ekatreg
*24504$aThe structure of foreign trade$cElhanan Helpman
*260  $aLondon$bThe Centre$c1998
*300  $a40 s.
*4901 $aDiscussion paper / Harvard Institute of Economic Research$vNo. 1848
*7000 $aHarvard Institute of Economic Research$0(NO-TrBIB)2087061$_36326700
*7001 $aHelpman, Elhanan$0(NO-TrBIB)90269017$_16033100
*830 0$aDiscussion paper series (Harvard Institute of Economic Research : trykt utg)$vNo. 1848$w999006412904702201$_15393300
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^