http://www.etui.org/Publications2/Working-Papers/Why-central-and-eastern-Europe-needs-a-pay-rise
https://www.cer.eu/sites/default/files/insight_JS_JP_17.1.23.pdf
https://visegradinsight.eu/central-european-nationalisms/
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1663en.pdf