http://www.rug.nl/research/portal/files/41711829/cesifo1_wp6448.pdf
https://ukandeu.ac.uk/wp-content/uploads/2022/10/UKICE-Northern-Ireland-Protocol-Bill.pdf
https://www.brookings.edu/blog/order-from-chaos/2018/01/05/the-brexit-options-explained/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=59815275
http://carnegieeurope.eu/2017/06/15/bringing-brexit-back-to-reality-pub-71262