https://www.brookings.edu/wp-content/uploads/2021/06/Moving-Up.pdf
https://www.wired.com/story/russian-techies-exodus-ukraine/?utm_source=newsletter&utm_medium=email&utm_campaign=23%2F03%2F22++(Copy)+(Copy)#intcid=_wired-verso-hp-trending_444226e1-5b4d-43c1-bdac-d4a2c5859d2f_popular4-1
https://www.ipg-journal.de/regionen/global/artikel/detail/vorbei-mit-der-freiwilligkeit-4508/
https://www.cer.eu/sites/default/files/insight_JS_JP_17.1.23.pdf