http://www.europarl.europa.eu/RegData/etudes/IDAN/2017/599352/EPRS_IDA%282017%29599352_EN.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/655232/DExEU_ARA_v5.0_amended_version_14.08.17__1_.pdf
https://www.esri.ie/system/files/publications/WP677_0.pdf
https://www.gov.uk/government/news/joint-article-a-deep-and-special-partnership