- Author: Delchev Alexander Semkov Semko.
- Language: English
- Author: Hoffmann A. Keener G.
- Language: English
- Author: Cozens W.H.
- Language: English
- Author: Pedersen Steffen.
- Language: English
- Author: Bellin Robert.
- Language: English
- Author: Palliser Richard Williams Simon Vigus James.
- Language: English
- Author: McDonald Neil.
- Language: English
- Author: Kindermann Stefan.
- Language: English
- Author: Avrukh Boris.
- Language: English
- Author: Kozul Zdenko Jankovic Alojzije.
- Language: English