| December 5, 2022 | Edited by tmanarl | merge authors |
| July 14, 2021 | Edited by Gustav-Landauer-Bibliothek Witten | merge authors |
| September 30, 2020 | Edited by MARC Bot | add ids |
| February 19, 2020 | Edited by Gustav-Landauer-Bibliothek Witten | merge authors |
| May 6, 2019 | Edited by Gustav-Landauer-Bibliothek Witten | links |