https://search.coe.int/cm/Pages/result_details.aspx?ObjectID=09000016809ed062
http://cep.lse.ac.uk/pubs/download/special/cepsp34.pdf
https://www.economiesuisse.ch/de/artikel/kluge-steuerpolitik-bringt-wohlstand
https://wiiw.ac.at/achieving-geoeconomic-goals-by-boosting-the-economy-without-raising-the-public-debt-ratio-new-evidence-on-the-effects-of-public-investment-in-the-european-union-dlp-7398.pdf