
http://www.iata.org/whatwedo/Documents/economics/impact_of_brexit.pdf

http://www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_num=6430&CESifoWP.search=+

https://blogs.lse.ac.uk/europpblog/2021/10/22/unexpected-lessons-from-spains-economic-rise/