http://www.economics-ejournal.org/economics/journalarticles/2017-4
https://www.ips-journal.eu/index.php?id=293&L=0&tx_news_pi1%5Bnews%5D=4441&tx_news_pi1%5Bcontroller%5D=News&tx_news_pi1%5Baction%5D=detail&utm_source=newsletter&utm_medium=email&utm_campaign=en_795_20200619&cHash=4a94c3414a78c7b0fe54218cc7da088b
http://www.ema.europa.eu/docs/en_GB/document_library/Press_release/2017/10/WC500236021.pdf
https://www.socialeurope.eu/eu-member-state-determined-others-greek-tragedy