https://ec.europa.eu/commission/publications/position-paper-transmitted-eu27-goods-placed-market-under-union-law-withdrawal-date_en
http://www.rug.nl/research/portal/files/41711829/cesifo1_wp6448.pdf
https://publications.parliament.uk/pa/cm200203/cmhansrd/vo021126/debtext/21126-17.htm