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Opladen: Westdeutscher Verlag, 1985
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Frankfurt am Main [u.a.]: Lang, 1994
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San Domenico di Fiesole (FI), Italy: European University Institute, Robert Schuman Centre for Advanced Studies, Migration Policy Centre, 2021
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[Brussels]: CEPS, 27 June 2019
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[Washington, DC]: Congressional Research Service, November 14, 2017
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Brussels: MPI Europe, May 2017