https://www.socialeurope.eu/2017/07/brexit-to-nowhere/
http://www.sussex.ac.uk/spru/newsandevents/2017/publications/food-brexit
http://www.assemblee-nationale.fr/14/pdf/rap-info/i4485.pdf
https://www.cesifo-group.de/DocDL/ifoDD_18-01_03-09_Ochsner.pdf