http://www.cer.org.uk/sites/default/files/insight_js_st_9.6.17.pdf
https://ec.europa.eu/commission/sites/beta-political/files/financial-settlement-essential-principles-draft-position-paper_en.pdf
http://www.wsta.co.uk/images/Brexit/Brexit_FINAL.pdf
https://www.instituteforgovernment.org.uk/sites/default/files/publications/IfG_Brexit_Euro_Court_Justice_WEB.pdf