Kohler-Koch, B. (1997) The European Union Facing Enlargement. Still a System sui generis? Mannheimer Zentrum für Sozialforschung, Arbeitspapiere/Work- ing papers, AB3/Nr. 20, available from http://www.mzes.uni-mannheim.de/ publications/wp/wp3-20.pdf, accessed 3 February 2009.
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Kohler-Koch, B. (1997). The European Union Facing Enlargement. Still a System sui generis? Mannheimer Zentrum für Sozialforschung, Arbeitspapiere/Work.
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