https://ukandeu.ac.uk/the-rise-and-rise-of-a-new-majority-in-northern-ireland/?mc_cid=7c246b3886&mc_eid=815b1928ec
https://publications.parliament.uk/pa/cm201719/cmselect/cmniaf/329/329.pdf
http://voxeu.org/system/files/epublication/Brexit_Beckons_VoxEU.pdf