https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef18005en.pdf
http://ftp.iza.org/dp11249.pdf
http://uk.reuters.com/article/uk-ecb-policy-draghi-idUKKBN19H1Z7?utm_source=POLITICO.EU&utm_campaign=b1a85f2c23-EMAIL_CAMPAIGN_2017_06_27&utm_medium=email&utm_term=0_10959edeb5-b1a85f2c23-189647205
http://www.britishchambers.org.uk/press-office/press-releases/bcc-firms-invest-in-local-labour-but-still-need-foreign-skills-to-plug-shortages.html