http://www.cer.org.uk/sites/default/files/insight_js_st_9.6.17.pdf
https://docs.iza.org/dp16728.pdf
http://www.lawyersforbritain.org/eu-deal-financial-liabilities.shtml
https://theconversation.com/why-the-eus-singapore-ruling-does-not-lead-to-a-smoother-brexit-road-for-britain-78116