- Author: Scientific American
- Language: English
- Year: 1998
- Author: Scientific American
- Language: English
- Year: 1998
- Author: Scientific American
- Language: English
- Year: 1993
- Author: Scientific American
- Language: English
- Year: 1998
- Author: Scientific American
- Language: English
- Year: 1993
- Author: Scientific American
- Language: English
- Year: 1999
- Author: Scientific American
- Language: English
- Year: 1993
- Author: Scientific American
- Language: English
- Year: 2000