https://www.socialeurope.eu/breaking-the-chains-subcontracting-in-the-eu
https://www.bruegel.org/2022/03/can-europe-manage-if-russian-oil-and-coal-are-cut-off/
https://wiiw.ac.at/digital-tasks-and-ict-capital-methodologies-and-data-dlp-6429.pdf
https://www.frbsf.org/wp-content/uploads/wp2020-17.pdf