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*1001 $aGreaker, Mads$d1963-$0(NO-TrBIB)97014864$_14498500
*24512$aA comment on the environment and directed technical change$cMads Greaker and Tom-Reiel Heggedal
*260  $aOslo$bStatistics Norway$c2012
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*4901 $aDiscussion papers / Statistics Norway, Research Department$vno. 713
*7001 $aHeggedal, Tom-Reiel$d1974-$0(NO-TrBIB)4006827$_71616000
*7760 $tA comment on the enviroment and directed technical change$w991235425534702201
*830 0$aDiscussion papers (Statistisk sentralbyrå. Forskningsavdelingen : trykt utg.)$vno. 713$w999328468404702201$_13976700
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