https://www.socialeurope.eu/wp-content/uploads/2018/01/Inequality-in-Europe-final.pdf
https://assets.cambridge.org/97811084/80932/frontmatter/9781108480932_frontmatter.pdf
https://blogs.lse.ac.uk/brexit/2020/02/28/fog-in-belfast-a-hundred-years-of-uneasiness-and-no-end-in-sight/