https://www.gov.uk/government/publications/information-about-the-withdrawal-bill
https://fabiusmaximus.com/2016/10/16/stratfor-eu-budget-battles-after-brexit/
https://rusi.org/sites/default/files/briefingpaper-france-uk-2017.pdf
https://ukandeu.ac.uk/long-read/the-protocol-post-brexit-northern-ireland/?mc_cid=9de7c359e6&mc_eid=815b1928ec