
http://www.egmontinstitute.be/content/uploads/2019/03/SPB108.pdf?type=pdf

https://ec.europa.eu/commission/publications/position-paper-transmitted-eu27-goods-placed-market-under-union-law-withdrawal-date_en

https://www.opendemocracy.net/can-europe-make-it/nick-rider/catalonia-spain-referendum-there-is-more-than-one-nationalism-in-iberian-peninsula