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Oslo: Statistics Norway, Research Dep., June 2008
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Oslo: Statistics Norway, Research Dep., 2009
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Oslo: Statistics Norway, Research Department, 2009
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Oslo: Statistics Norway, Research Department, 2008
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Oslo: Statistics Norway, Research Department, 2006
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Oslo: Statistics Norway, Research Department, 2004
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[S.l.]: SSRN, 2002
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Oslo: Statistics Norway, Research Department, 2002
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Oslo: Statistics Norway, Research Department, 2000
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Oslo: Statistics Norway, Research Department, 1996
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Oslo: Statistics Norway, Research Department, 2002
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Oslo: Statistics Norway, Research Department, 2006
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Oslo: Statistics Norway, Research Department, 2006
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Oslo: Statistics Norway, Research Department, 2003
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Oslo: Statistics Norway, Research Department, 1995
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Oslo: Statistics Norway, Research Dep., 2012
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Oslo: Statistics Norway, Research Department, 2012
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Oslo: Statistics Norway, Research Department, 2003
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Copenhagen: Nordic Council of Ministers, 20/5/2022
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Scientific Research Publishing, Inc., 2013