http://www.case-research.eu/files/?id_plik=5223
https://knowledge.wharton.upenn.edu/article/how-the-u-s-could-stabilize-debt-and-fuel-economic-growth/
https://rlo.acton.org/archives/125251-milton-friedman-the-conservative-institution-builder.html
https://www.politico.eu/article/germany-9-euro-ticket-train-public-transport/?utm_source=POLITICO.EU&utm_campaign=41557aa1fc-EMAIL_CAMPAIGN_2022_10_14_11_29&utm_medium=email&utm_term=0_10959edeb5-41557aa1fc-190380769