https://wiiw.ac.at/the-labour-market-entry-and-integration-of-refugees-and-other-migrants-in-austria-dlp-6700.pdf
http://www.assemblee-nationale.fr/14/pdf/rap-info/i4551.pdf
https://theconversation.com/the-greek-migrant-shipwreck-is-another-preventable-tragedy-at-the-borders-of-europe-207880