https://www.socialeurope.eu/2017/05/irelands-brexit-borders-possible-solution/
https://www.gov.uk/government/news/ip-and-brexit-the-facts
http://semantic-pace.net/tools/pdf.aspx?doc=aHR0cDovL2Fzc2VtYmx5LmNvZS5pbnQvbncveG1sL1hSZWYvWDJILURXLWV4dHIuYXNwP2ZpbGVpZD0yNDQ0NCZsYW5nPUVO&xsl=aHR0cDovL3NlbWFudGljcGFjZS5uZXQvWHNsdC9QZGYvWFJlZi1XRC1BVC1YTUwyUERGLnhzbA==&xsltparams=ZmlsZWlkPTI0NDQ0
https://curia.europa.eu/jcms/upload/docs/application/pdf/2021-06/cp210091es.pdf