http://www.niesr.ac.uk/sites/default/files/publications/NIESR%20EU2%20MIGRATION%20REPORT.pdf
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1036046/An_Inspection_of_UK_Visas_and_Immigration_Front_End_Services__August_2020_to_June_2021.pdf
https://undocs.org/en/A/CONF.231/3
https://www.bruegel.org/event/war-ukraine-what-effect-central-and-eastern-europe