https://www.boeckler.de/pdf/p_imk_report_141e_2018.pdf
https://www.brookings.edu/blog/future-development/2018/01/08/a-new-years-resolution-to-address-wage-inequality-in-firms/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=59882754
http://futurion.se/wp-content/uploads/2018/03/Futurion_Rapport_2018-1_webb.pdf
https://www.socialeurope.eu/2017/07/real-measure-inequality/