"Archived copy". www.bundesnetzagentur.de. Archived from the original on 22 July 2012. Retrieved 6 June 2022.{{cite web}}: CS1 maint: archived copy as title (link)
"Archived copy". www.bundesnetzagentur.de. Archived from the original on 22 July 2012. Retrieved 6 June 2022.{{cite web}}: CS1 maint: archived copy as title (link)