https://ec.europa.eu/growth/tools-databases/dem/monitor/sites/default/files/DTM_Industrie%204.0.pdf
https://www.mckinsey.com/industries/technology-media-and-telecommunications/our-insights/rules-of-engagement-winning-with-the-basics-in-digital-telecommunications
https://eur-lex.europa.eu/legal-content/FR/TXT/PDF/?uri=CELEX:32019L2121&from=EN
https://ies.fsv.cuni.cz/default/file/download/id/33794