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*1001 $aHeckman, James J.$0(NO-TrBIB)90276251$_26578800
*24510$aSelection bias, comparative advantage and heterogeneous returns to education :$bevidence from China in 2000$cJames J. Heckman, Xuesong Li
*260  $aCambridge, Mass.$bNational Bureau of Economic Research$c2003
*300  $a29 s.$bill.
*4901 $aWorking paper series / National Bureau of Economic Research$v9877
*7001 $aLi, Xuesong$0(NO-TrBIB)3086226$_65558000
*830 0$aWorking paper series (National Bureau of Economic Research : trykt utg.)$x0898-2937$v9877$w999105437124702201$_13074900
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*999  $aoai:nb.bibsys.no:990315084484702202$b2021-11-14T20:15:16Z$z990315084484702202
^