https://theconversation.com/fact-check-does-immigration-have-an-impact-on-wages-or-employment-83666
http://www.ips-journal.eu/topics/human-rights/article/show/lets-not-lose-our-thread-2155/
https://www.destatis.de/DE/PresseService/Presse/Pressemitteilungen/2017/08/PD17_261_12511pdf.pdf?__blob=publicationFile