https://uk.finance.yahoo.com/news/britain-public-finances-worse-gambia-153245680.html
https://www.ccomptes.fr/system/files/2019-07/20190716-rapport-regimes-speciaux-retraite.pdf
http://www.case-research.eu/files/?id_plik=5223
http://blogs.lse.ac.uk/europpblog/2018/11/09/germanys-non-rebalancing-of-its-mercantilist-model/?fbclid=IwAR27iG5mvfm7OhdEvLvAgSDfPWaVzY7AgWp2WCZ278P3NblPgDgEqqWDkGI