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Boppard am Rhein: Boldt, 1992
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Gütersloh: Centrum für Hochschulentwicklung gGmbH, 2007
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Bruxelles: Editions de l'Université de Bruxelles, 2009
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Bruxelles: Éditions de l'Université de Bruxelles, 2009
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Informa UK Limited, 2008
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Organisation for Economic Co-Operation and Development (OECD), 2003
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Organisation for Economic Co-Operation and Development (OECD), 2003
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Informa UK Limited, 2002
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2007
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2007
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Springer Science and Business Media LLC, 2010