
- Author: Steinar Johannesen
- Language: English
- Year: 2016

- Author: Gengzhe Chang Thomas W. Sederberg
- Language: English
- Year: 1997

- Author: John W Schutz
- Language: English
- Year: 1997

- Author: V. P. Maslov G. A. Omel’yanov
- Language: English
- Year: 2001

- Author: V.G. Boltianskii
- Language: English
- Year: 1978

- Author: Hitoshi Moriyoshi and Toshikazu Natsume
- Language: English
- Year: 2008

- Author: Jean-Paul Gauthier Ivan Kupka
- Language: English
- Year: 2001

- Author: Aleksei V. Pogorelov
- Language: English
- Year: 1979