Gotlieb, A.E. (1969). "Direct Satellite Broadcasting: A Case Study in the Development of the Law of Space Communications". The Canadian Yearbook of International Law 1969. 7: 33–60. doi:10.1017/S0069005800011826. S2CID169142288.
"Satellitenfernsehen in Deutschland" [Satellite TV in Germany]. kabelfernsehen-kabelanschluss.de (in German). Archived from the original on 15 April 2016. Retrieved 5 April 2016.
"Industry History". sbca.com. Satellite Broadcasting and Communications Association. 2014. Archived from the original on 19 February 2014. Retrieved 5 June 2014.
semanticscholar.org
api.semanticscholar.org
Gotlieb, A.E. (1969). "Direct Satellite Broadcasting: A Case Study in the Development of the Law of Space Communications". The Canadian Yearbook of International Law 1969. 7: 33–60. doi:10.1017/S0069005800011826. S2CID169142288.
skyrocket.de
space.skyrocket.de
"Ekran (11F647)". space.skyrocket.de. Archived from the original on 2020-01-02. Retrieved 2019-12-06.
"Satellitenfernsehen in Deutschland" [Satellite TV in Germany]. kabelfernsehen-kabelanschluss.de (in German). Archived from the original on 15 April 2016. Retrieved 5 April 2016.
"Industry History". sbca.com. Satellite Broadcasting and Communications Association. 2014. Archived from the original on 19 February 2014. Retrieved 5 June 2014.