file:///C:/Users/cooma_000/Downloads/EconPol_Policy_Report_02_2017_German_Account_Surplus.pdf
http://www.case-research.eu/files/?id_plik=5223
https://library.fes.de/pdf-files/wiso/14700.pdf
https://www.whitehouse.gov/wp-content/uploads/2021/05/budget_fy22.pdf