https://www.bakerinstitute.org/media/files/files/ac785a2b/BI-Brief-071817-CES_Russia1.pdf
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef19045en.pdf
https://ec.europa.eu/competition/state_aid/cases1/201927/277937_2079330_55_2.pdf