https://www.esri.ie/system/files/publications/RS155.pdf
https://ecipe.org/wp-content/uploads/2024/05/ECI_OccasionalPaper_03-2024_LY04.pdf
http://www.cbi.org.uk/index.cfm/_api/render/file/?method=inline&fileID=FC18E9C9-C854-4578-AE0D9A1C9367ABC6
https://www.mckinsey.com/industries/technology-media-and-telecommunications/our-insights/the-telecom-sector-in-2020-and-beyond?cid=other-eml-alt-mip-mck&hdpid=2a59335f-eea4-491d-bc81-9a8a4d69d739&hctky=2073353&hlkid=700e64d6b4b64a719cb2f314d4ed4afb#