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Bonn: Institute for the Study of Labor (IZA), 2009
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Geneve: International Organization for Standardization, 1997
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[S.l.]: SSRN, 2011
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London: Queen Mary University of London, Department of Economics, 2007
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Walter de Gruyter GmbH, 2011
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Elsevier BV, 2009
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Elsevier BV, 2008
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Springer Science and Business Media LLC, 2000
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Institute of Electrical and Electronics Engineers (IEEE), 1993
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Wiley, 2014
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BMJ, 2011
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Elsevier BV, 2011
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Elsevier BV, 2011