https://opportunityinsights.org/wp-content/uploads/2020/05/tracker_paper.pdf
http://www.geog.qmul.ac.uk/media/geography/docs/research/working-beyond-the-border/Governing-Labour-Standards.pdf
https://www.parliament.uk/documents/commons-committees/culture-media-and-sport/181116-Grand-ctte-to-Mark-Zuckerberg.pdf
https://e-justice.europa.eu/content_european_judicial_network_in_civil_and_commercial_matters-21-es.do?init=true