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Published: Sankt Augustin ; Berlin : Konrad-Adenauer-Stiftung, 2009.
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Published: München : Schobert, 1986.
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Published: Münster, Westf : LIT, 2008.
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Published: Bremen : Donat, 1988.
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Published: Minneapolis , Minn. : Fortress Press, 2000.
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Published: Stuttgart [u.a.] : Burg Verl, 1990.
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