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- Language: English
- Year: 2005

- Author: Dale Serjeantson T. Waldron
- Language: English
- Year: 1989

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- Language: Spanish
- Year: 2010

- Author: Kolawole David Aiyedun Thurstan Shaw
- Language: English
- Year: 1989

- Author: Ajay Pratap
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- Author: Manuela Wagner
- Language: German
- Year: 2000