http://www.europeaninstitute.org/index.php/311-european-affairs/ea-october-2017/2242-as-chinese-investment-rises-in-europe-brussels-proposes-greater-scrutiny-of-foreign-purchases-of-eu-based-companies
https://www.strategie.gouv.fr/sites/strategie.gouv.fr/files/atoms/files/fs-na82-entreprises-zombies-octobre-2019.pdf
https://www.brookings.edu/articles/disquiet-in-the-worlds-middle-class/