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New York: Columbia Univ. Press, 2006
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Köln: Pahl-Rugenstein, 1987
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New York [u.a.]: Pergamon Press, 1979
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London [u.a.]: Routledge, 2008
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Bonn: Dietz, 2003
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Hamburg: Lit-Verl., 1997
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München: Oldenbourg, 1995
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2021
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[Washington, DC]: CATO Institute, June 26, 2017
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[Washington, DC]: Congressional Research Service, April 23, 2020
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[Washington, DC]: Congressional Research Service, March 21, 2019
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[Washington, DC]: Congressional Research Service, March 12, 2021
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[Washington, DC]: Congressional Research Service, November 23, 2021