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- Language: German
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- Language: German
- Year: 1992
- Author: John L. Renne (ed.) Billy Fields (ed.)
- Language: English
- Year: 2013
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- Author: Sheldon S. Williamson (auth.)
- Language: English
- Year: 2013
- Author: Ross Dobson
- Language: German
- Year: 2011
- Author: Rolf Kehlhofer
- Language: English
- Year: 1997