
https://eur-lex.europa.eu/legal-content/IT/TXT/PDF/?uri=CELEX:52019DC0406&from=FR

https://www.brookings.edu/techstream/how-do-recommender-systems-work-on-digital-platforms-social-media-recommendation-algorithms/

http://www.bertelsmann-stiftung.de/en/topics/aktuelle-meldungen/2017/september/germans-are-more-optimistic-about-their-future-than-their-european-neighbours/