| April 10, 2020 | Edited by Gustav-Landauer-Bibliothek Witten | merge authors |
| June 6, 2012 | Edited by VacuumBot | Removed period from death date |
| April 1, 2008 | Created by an anonymous user | initial import |
| April 10, 2020 | Edited by Gustav-Landauer-Bibliothek Witten | merge authors |
| June 6, 2012 | Edited by VacuumBot | Removed period from death date |
| April 1, 2008 | Created by an anonymous user | initial import |