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- Language: English
- Year: 1998

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- Language: English
- Year: 2016

- Author: Sanning Walter N.
- Language: German
- Year: 1983

- Author: Brown James F
- Language: English
- Year: 2001

- Author: Armour Ian D
- Language: English
- Year: 2012

- Author: Armour Ian D
- Language: English
- Year: 2012