
http://www.cesifo-group.de/ifoHome/publications/working-papers/CESifoWP/CESifoWPdetails?wp_num=6456&CESifoWP.search=+

http://blogs.sussex.ac.uk/uktpo/files/2017/11/Briefing-Paper-11.pdf

https://www.politico.eu/article/paul-magnette-belgium-wallonia-returns-to-spoil-europe-free-trade-agenda/?utm_source=newsletter&utm_medium=email&utm_campaign=26%2F09%2F22