https://www.cer.eu/sites/default/files/insight_SL_5.11.19_2.pdf
http://www.rug.nl/research/portal/files/41711829/cesifo1_wp6448.pdf
https://openeurope.org.uk/today/blog/what-would-a-no-deal-after-the-transition-period-look-like/
https://committees.parliament.uk/publications/40412/documents/197199/default/