https://ec.europa.eu/commission/sites/beta-political/files/outline_of_the_political_declaration.pdf
http://www.transfrontier.eu/regions/ireland-northern-ireland/
https://urldefense.com/v3/__http:/liseuse.harmattan.fr/978-2-343-22496-1__;!!DOxrgLBm!RvRbHRx6Kt_Im0YooeSKul-1pdH3rrehJbewxga1m1XfdG_l66dacHGtbssMnGHPjvgLKb6ClUlbH3wttsPZTQ$
https://dbei.gov.ie/en/Publications/Publication-files/Ireland-and-the-Impacts-of-Brexit.pdf