http://www.europarl.europa.eu/RegData/etudes/IDAN/2017/599352/EPRS_IDA%282017%29599352_EN.pdf
https://publications.parliament.uk/pa/cm201719/cmselect/cmbeis/379/379.pdf
https://ukandeu.ac.uk/trade-migration-and-brexit/
http://reutersinstitute.politics.ox.ac.uk/risj-review/sympathetic-unconcerned-how-europes-media-cover-brexit