https://openeurope.org.uk/today/blog/what-would-a-no-deal-after-the-transition-period-look-like/
http://www.nfuonline.com/assets/96747
http://www.iata.org/whatwedo/Documents/economics/impact_of_brexit.pdf
http://www.oliverwyman.com/content/dam/oliver-wyman/v2/publications/2018/march/Oliver-Wyman_Clifford-Chance-The-Red-Tape-Cost-of-Brexit.pdf