- Author: Surányi János
- Language: German
- Year: 1959
- Author: Klaus Heidler Hans Hermes Friedrich Mahn
- Language: German
- Year: 1977
- Author: Stephen C. Kleene
- Language: English
- Year: 1969
- Author: Church Alonzo
- Language: English
- Year: 1941
- Author: Sacks Gerald E.
- Language: English
- Year: 1963