- Author: Jorge Guillén
- Language: English
- Year: 1961
- Author: Naji Oueijan
- Language: English
- Year: 2023
- Author: Würtenberger Thomas jun.
- Language: German
- Year: 1973
- Author: Würthner Christina
- Language: German
- Year: 2001
- Author: Thoß Hendrik, Müller Mario H.
- Language: German
- Year: 2018
- Author: Stump Ulrich
- Language: German
- Year: 1980