https://www.brookings.edu/wp-content/uploads/2023/09/6_Moll-et-al_unembargoed_updated.pdf
https://www.mckinsey.com/industries/technology-media-and-telecommunications/our-insights/rules-of-engagement-winning-with-the-basics-in-digital-telecommunications
https://www.bertelsmann-stiftung.de/fileadmin/files/BSt/Publikationen/GrauePublikationen/WKIO_2020_final.pdf?utm_source=POLITICO.EU&utm_campaign=15a7cc1e87-EMAIL_CAMPAIGN_2020_04_08_08_59&utm_medium=email&utm_term=0_10959edeb5-15a7cc1e87-190380769
http://library.fes.de/pdf-files/wiso/14397.pdf