http://www.economics-ejournal.org/economics/journalarticles/2017-10
https://www.socialeurope.eu/2017/06/the-case-for-an-investment-state/
https://www.linkiesta.it/2020/05/cosa-ha-davvero-deciso-la-corte-tedesca-bce-quantitative-easing/
https://www.eca.europa.eu/Lists/ECADocuments/REW19_09/REW_EU-defence_EN.pdf