
- Author: Nicolae N. Mihăileanu
- Language: Romanian
- Year: 1971

- Author: János Kollár Max Lieblich Martin Olsson Will Sawin
- Language: English
- Year: 2023

- Author: Sigurdur Helgason
- Language: English
- Year: 2001

- Author: A. T. Chahly
- Language: English
- Year: 1968

- Author: L. I. Golovina and I. M. Yaglom
- Language: English
- Year: 1979

- Author: V. O. Gordon M. A. Sementsov-Ogievskii
- Language: English
- Year: 1980

- Author: D. Kletenik
- Language: English

- Author: Alekseĭ Vasilʹevich Pogorelov
- Language: English
- Year: 1954