https://ec.europa.eu/info/sites/info/files/economy-finance/ip127_en.pdf
https://www.eca.europa.eu/Lists/ECADocuments/Briefing_paper_MFF/Briefing_paper_MFF_EN.pdf
https://scholar.harvard.edu/files/rogoff/files/ilzetki_reinhart_rogoff_qje_2019_2.pdf
http://www.economics-ejournal.org/economics/journalarticles/2017-10