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200 1 $aTrade policy and market structure$fElhanan Helpman and Paul R. Krugman
210   $aCambridge (Mass.)$aLondon$cThe MIT press$d1992
215   $aXII, 191 p.$cgraf.$d23 cm
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610 1 $aCommercio internazionale
610 1 $aPolitica commerciale
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