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*035  $a(EXLNZ-47BIBSYS_NETWORK)990219287384702201
*035  $a(NO-LaBS)14942876(bibid)
*035  $a(NO-TrBIB)021928738
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*040  $aNO-TrBIB$bnob$ekatreg
*1001 $aHeckman, James J.$0(NO-TrBIB)90276251$_26578800
*24514$aThe performance of performance standards$cJames J. Heckman, Carolyn Heinrich, Jeffrey Smith
*260  $aCambridge, Mass.$bNational Bureau of Economic Research$c2002
*300  $a48 s.
*4901 $aWorking paper series / National Bureau of Economic Research$v9002
*7001 $aHeinrich, Carolyn J.$0(NO-TrBIB)12017399$_43184500
*7001 $aSmith, Jeffrey$0(NO-TrBIB)98005319$_43184600
*830 0$aWorking paper series (National Bureau of Economic Research : trykt utg.)$x0898-2937$v9002$w999105437124702201$_13074900
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*999  $aoai:nb.bibsys.no:990219287384702202$b2021-11-14T19:55:37Z$z990219287384702202
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