https://ec.europa.eu/commission/sites/beta-political/files/seminar-20200114-lpf_en.pdf
http://fedtrust.co.uk/brexitthe-conservative-centre-cannot-hold/
http://www.ips-journal.eu/regions/europe/article/show/lessons-for-the-left-2270/
http://library.fes.de/pdf-files/bueros/suedafrika/02828.pdf