https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef20023en.pdf
https://www.cer.eu/sites/default/files/insight_JS_JP_17.1.23.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/602309/58551_NHS_PRB_Accessible.pdf
http://blog.arbeit-wirtschaft.at/mindestlohn-zufriedenere-beschaeftigte/