<ul><li><a href=http://www.gesetze-im-internet.de/tkg_2021/ target=_blank>Telecommunications Act(Telekommunikationsgesetz (TKG) par. 37-48, 23 June 2021, (BGBI I p. 1858), last updated on 10 September 2021 (BGBl. I p. 4147))</a></li><li><a href=https://www.bundesnetzagentur.de/SiteGlobals/Forms/Suche/Expertensuche_Formular.html target=_blank>Decision BK3-13/002(Bundesnetzagentur, Decision BK3-13/002)</a></li></ul>