- Author: Holm Gero Hümmler
- Language: German
- Year: 2019
- Author: Gilbert Brands
- Language: German
- Year: 2011
- Author: Frank Haußer, Yuri Luchko
- Language: German
- Year: 2019
- Author: Gisela Büchele, Martin Rehm, Rainer Muche
- Language: German
- Year: 2019
- Author: Lukas Pottmeyer
- Language: German
- Year: 2019
- Author: Michael A. Liberman
- Language: English
- Year: 2008
- Author: by Paul R. Halmos.
- Language: English
- Author: Richard Courant Fritz John
- Language: English
- Year: 1989
- Author: Vittorio Magnago Lampugnani (editor)
- Language: English
- Year: 1999