<ul><li><a href=http://www.rostelecom.ru/en/about/info/ target=_blank>Information about Rostelecom</a></li><li><a href=https://www.company.rt.ru/ir/results_and_presentations/presentations/2021-08_Investor_presentation_RU.pdf target=_blank>Rostelecom's presentation for investors, 2021, p. 36</a></li></ul>