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*019  $bl
*035  $a(EXLNZ-47BIBSYS_NETWORK)990209876844702201
*035  $a(NO-LaBS)14412379(bibid)
*035  $a(NO-TrBIB)020987684
*035  $a020987684-47bibsys_network
*040  $aNO-TrBIB$bnob$ekatreg
*24500$aDouble trouble :$bon the value of twins-based estimation of the return to schooling
*260  $aCambridge, Mass.$bNBER$c1998
*300  $a31,[1] s.
*4901 $aNBER working paper series$v6721
*7001 $aBound, John$_16194900
*7001 $aSolon, Gary$_63437400
*7102 $aNational Bureau of Economic Research (Forente Stater)$_13074800
*830 0$aWorking paper series (National Bureau of Economic Research : trykt utg.)$x0898-2937$v6721$w999105437124702201$_13074900
*901  $a60
*999  $aoai:nb.bibsys.no:990209876844702202$b2021-11-14T20:13:35Z$z990209876844702202
^