
https://open.overheid.nl/documenten/ronl-48b77cf7bdf0f91d4ed394ca2a37d2041bc50647/pdf

http://www.ips-journal.eu/regions/global/article/show/davos-2018-call-the-doctor-2544/

https://www.socialeurope.eu/progressive-taxation-for-a-renewed-social-contract