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*1001 $aHægeland, Torbjørn$d1969-$0(NO-TrBIB)90771163$_14710400
*24510$aSchool performance and value-added indicators - what is the effect of controlling for socioeconomic background?$cTorbjørn Hægeland and Lars J. Kirkebøen
*260  $aOslo$bStatistics Norway$c2008
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*7001 $aKirkebøen, Lars Johannessen$d1979-$0(NO-TrBIB)5031864$_35178400
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