http://www.telegraph.co.uk/news/2017/05/23/66m-migrants-waiting-cross-europe-africa-report/
https://migrationdataportal.org/blog/10-coolest-visualizations-migration-data?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=61078421
http://www.guengl.eu/news/article/gue-ngl-news/adoption-of-the-european-travel-information-and-authorisation-system-a-hidd
https://www.publications.parliament.uk/pa/cm201617/cmselect/cmexeu/1125/1125.pdf