https://www.epp.eu/files/uploads/2017/04/11-EPP-Resolution-1-2.pdf
http://www.migrationobservatory.ox.ac.uk/resources/commentaries/brexodus-migration-and-uncertainty-after-the-eu-referendum/
https://www.unhcr.org/gcr/GCR_English.pdf
https://docs.iza.org/dp16728.pdf