http://www.ips-journal.eu/regions/europe/article/show/myth-of-the-echo-chamber-2135/
https://www.dsgv.de/newsroom/presse/190912_PM_EZB_30.html
https://www.bruegel.org/wp-content/uploads/2021/05/PC-2021-11-ecofin-210521.pdf
https://www.diw.de/documents/publikationen/73/diw_01.c.578096.de/18-7-3.pdf