- Author: Canny et al.
- Language: English
- Author: McCormack et al.
- Language: English
- Author: Reid et al.
- Language: English
- Author: Jeffrey et al.
- Language: English
- Author: Winkler Buchberger et al.
- Language: English
- Author: Marinari et al.
- Language: English
- Author: Giovini et al.
- Language: English
- Year: 1991
- Author: Giovini et al.
- Language: English
- Year: 1991
- Author: Cucker et al.
- Language: English
- Author: Guisti et al.
- Language: English
- Year: 1997