
http://www.ips-journal.eu/regions/global/article/show/why-pollsters-normally-get-it-right-more-or-less-2299/

https://www.openglobalrights.org/landmark-judgment-from-netherlands-on-digital-welfare-states/?lang=English

https://researchbriefings.files.parliament.uk/documents/CBP-9255/CBP-9255.pdf