D-Box und Mediamaster: Was geht heute noch damit? https://www.digitalfernsehen.de/news/technik/video/d-box-und-mediamaster-was-geht-heute-noch-damit-1121422/
QSL Welle 370 Das Funkerberg Radio https://petersdxcorner.nl/germany/qsl-welle-370-das-funkerberg-radio/
These Were the Carts of Our Lives https://www.radioworld.com/columns-and-views/roots-of-radio/these-were-the-carts-of-our-lives