Sources :
(1) https://www.gartner.com/en/newsroom/press-releases/2020-07-23-gartner-forecasts-worldwide-public-cloud-revenue-to-grow-6point3-percent-in-2020
(2) https://www.computerworld.com/article/3102904/four-us-companies-rule-the-worlds-cloud-infrastructure.html
(3) https://www.canalys.com/newsroom/worldwide-cloud-market-q320
(4) https://www.cnil.fr/fr/cloud-computing-les-conseils-de-la-cnil-pour-les-entreprises-qui-utilisent-ces-nouveaux-services (5) https://www.ssi.gouv.fr/uploads/IMG/pdf/2010-12-03_Guide_externalisation.pdf
(6) https://www.data-infrastructure.eu/GAIAX/Navigation/EN/Home/home.html