
https://www.ips-journal.eu/interviews/theres-a-broad-consensus-in-denmark-around-migration-7635/

https://www.un.org/esa/population/publications/migration/migration.htm

http://oegfe.at/wordpress/2017/05/the-free-movement-of-workers-within-the-eu-and-the-case-of-austria-balancing-distortions-and-adding-value-op-ed-paul-schmidt-the-european-financial-review/