http://uk.reuters.com/article/uk-britain-eu-immigration-idUKKBN18L0XG
https://www.unhcr.org/5ee200e37.pdf
https://www.socialeurope.eu/romania-and-bulgaria-stuck-in-eus-second-tier
https://www.dw.com/en/swedens-population-shrinks-for-first-time-in-50-years/a-69893811