http://www.oecd.org/els/soc/Risks-That-Matter-2018-Main-Findings.pdf
http://www.case-research.eu/files/?id_plik=5223
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef19056en.pdf
https://reader.chathamhouse.org/europes-political-tribes#