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*1001 $aHeinesen, Eskil$4aut$_112591400
*24510$aInstrumental variables with unordered treatments: Theory and evidence from returns to fields of study
*264 1$aOslo$bDepartment of Economics, University of Oslo$c2022
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*4900 $aMemorandum$v3/2022$x08098786
*7001 $aHvid, Christian$4aut$_206638400
*7001 $aKirkebøen,, Lars$4aut$_206638500
*7001 $aLeuven , Edwin$4aut$_206638600
*7001 $aMogstad, Magne$4aut$_130522800
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