
http://www.msz.gov.pl/en/news/deputy_minister_renata_szczech_takes_part_in_a_debate_on_europe_s_future

https://www.sciencedirect.com/science/article/pii/S0022199617301411

https://www.piie.com/blogs/realtime-economics/if-markets-are-right-about-long-real-rates-public-debt-ratios-will