https://www.unhcr.org/gcr/GCR_English.pdf
https://voxdev.org/topic/labour-markets-migration/let-their-people-come-migrants-drivers-knowledge-diffusion
https://ec.europa.eu/home-affairs/sites/homeaffairs/files/e-library/documents/policies/organized-crime-and-human-trafficking/corruption/docs/acr_2014_en.pdf
https://www.socialeurope.eu/romania-and-bulgaria-stuck-in-eus-second-tier