https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1609en.pdf
http://ec.europa.eu/social/main.jsp?catId=1143&intPageId=3193&langId=en/
http://www.sgi-network.org/2017/About
https://ukandeu.ac.uk/out-of-rhythm-how-the-war-in-ukraine-complicates-the-franco-german-relationship/