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- Language: English
- Year: 1993

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- Language: English
- Year: 2003

- Author: Niels Peter Lemche
- Language: English
- Year: 1991

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- Language: English
- Year: 1996

- Author: Christo H. J. Van Der Merwe Jackie A. Naude Jan H. Kroeze
- Language: English
- Year: 1999

- Author: Isaiah M. Gafni
- Language: English
- Year: 1997

- Author: Geert-Jan Boons and Karl J.Hale
- Language: English
- Year: 2000

- Author: Keith Branigan
- Language: English
- Year: 2001