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Stuttgart: Ernst Klett Sprachen, [2017]
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Stuttgart: Klett Sprachen, 2013
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Stuttgart: Klett Sprachen, 2013
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Stuttgart: Klett Sprachen, 2013-
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Bonn: Varus Verlag, 2010
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Bonn: Varus-Verl., 1994
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1981
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Stuttgart: Klett, Ed. Deutsch, 2004
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Halle (Saale), Germany: Halle Institute for Economic Research (IWH) - Member of the Leibniz Association, [15. August 2019]
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Halle (Saale), Germany: Halle Institute for Economic Research (IWH) - Member of the Leibniz Association, [2019]
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Halle (Saale): Halle Institute for Economic Research (IWH), 2020
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2015
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2015
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2015