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- Language: English
- Year: 1994

- Author: Georg Glaeser
- Language: English
- Year: 1994

- Author: Georg Glaeser
- Language: German
- Year: 2010

- Author: Georg Glaeser Hans-Peter Schröcker
- Language: English
- Year: 2002

- Author: Georg Glaeser Hans-Peter Schröcker
- Language: English
- Year: 2002

- Author: Georg Glaeser Hans-Peter Schröcker
- Language: English
- Year: 2002