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              Hammar, T (1989), State, Nation and Dual Citizenship, in: R. Brubaker (ed.): Immigra- tion and the Politics of Citizenship in Europe and North America, 81-95. Lanham/New York: University Press of America.
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              Hammar, T. (1989) State Nation and Dual Citizenship. In Brubaker, W. R. (ed) Immigration and Politics of Citizenship in Europe and North America. Lanham: German Marshall Fund of the United States.
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              Hammar, Tomas (1989) State, nation, and dual citizenship. In: William Rogers Brubacker (ed.) Immigration and the Politics of Citizenship in Europe and North America. Washington, DC: University Press of America.
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              Hammar, Tomas (1989), State, Nation, and Dual Citizenship. In: William Rogers Bruba¬ ker (Hg.), Immigration and the Politics of Citizenship in Europe and North Ameri¬ ca. Lanham u.a. 1989: 81-96.
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              Hammar, Tomas (1989): »State, Nation, and Dual Citizenship«. In: William Rogers Brubaker (Hg.), Immigration and the Politics of Citizenship in Europe and North America, Lanham, MD: Universi- ty Press of America, S. 81-96.
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              Hammar, Tomas. 1989. State, nation, and dual citizenship. In Immigration and the politics of citizenship in Europe and North America, Hrsg. Rogers Brubaker, 81-95. Lanham/Wa- shington, D.C.: University Press of America/German Marshall Fund of the United States.
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