
http://www.lastampa.it/2016/06/27/italia/politica/rodot-quando-i-referendum-diventano-un-boomerang-JuXpMSRHAkJH5mE0mawMrL/pagina.html

https://committees.parliament.uk/publications/40412/documents/197199/default/

https://internationalepolitik.de/system/files/article_pdfs/IP_05-2020_Kurtz_oB.pdf