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*1001 $aHansen, Karsten$0(NO-TrBIB)90560130$_28484200
*24514$aThe effect of schooling and ability on achievement test scores$cKarsten hansen, James J. Heckman, Kathleen J. Mullen
*260  $aCambridge, Mass.$bNational Bureau of Economic Research$c2003
*300  $a41, [26] s.$bill.
*4901 $aWorking paper series / National Bureau of Economic Research$v9881
*7001 $aHeckman, James J.$0(NO-TrBIB)90276251$_26578800
*7001 $aMullen, Kathleen$0(NO-TrBIB)3086618$_87791800
*830 0$aWorking paper series (National Bureau of Economic Research : trykt utg.)$x0898-2937$v9881$w999105437124702201$_13074900
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*999  $aoai:nb.bibsys.no:990315152664702202$b2021-11-14T20:33:26Z$z990315152664702202
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