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Published: München : Hanns-Seidel-Stiftung, 2007
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Published: Göttingen : Lamuv-Verl, 1993.
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Published: Düsseldorf : IDA-NRW, 1999.
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Published: New York : Pitman Publ. Corporation, 1971.
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Published: Frankfurt am Main : Brandes & Apsel, 2003
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