
- Author: conf. Gheorghe D. Simionescu
- Language: Romanian
- Year: 1982

- Author: Gh. D. Simionescu
- Language: Romanian
- Year: 1967

- Author: Prof. univ. C. Ionescu-Bujor Conf. univ. O. Sacter
- Language: Romanian
- Year: 1963

- Author: C. Mihalescu
- Language: Romanian
- Year: 1957