https://www.journalismliberty.org/publications/beggars-and-choosers-facebook-google
https://english.bdi.eu/media/presse/presse/downloads/20180308_Climate_Paths_for_Germany_ExecutiveSummary_FINAL.pdf
https://www.fawcettsociety.org.uk/Handlers/Download.ashx?IDMF=bb90467f-174b-4f68-801a-4ae04e4fd33c
http://library.fes.de/pdf-files/iez/13375.pdf