https://ukandeu.ac.uk/wp-content/uploads/2019/12/Brexit-the-manifestos-uncovered.pdf
http://www.strengthentheeuro.eu/fileadmin/files/user_upload/EZ_flashlight_europe_2017_05_ENG.pdf
https://www.vdma.org/v2viewer/-/v2article/render/21059151
https://www.ifs.org.uk/publications/10302