https://www.socialeurope.eu/2017/05/irelands-brexit-borders-possible-solution/
https://edri.org/wp-content/uploads/2020/05/Paper-Ban-Biometric-Mass-Surveillance.pdf?utm_source=POLITICO.EU&utm_campaign=28e4eafd7f-EMAIL_CAMPAIGN_2020_05_20_09_00&utm_medium=email&utm_term=0_10959edeb5-28e4eafd7f-190380769
http://semantic-pace.net/tools/pdf.aspx?doc=aHR0cDovL2Fzc2VtYmx5LmNvZS5pbnQvbncveG1sL1hSZWYvWDJILURXLWV4dHIuYXNwP2ZpbGVpZD0yNDQ0NCZsYW5nPUVO&xsl=aHR0cDovL3NlbWFudGljcGFjZS5uZXQvWHNsdC9QZGYvWFJlZi1XRC1BVC1YTUwyUERGLnhzbA==&xsltparams=ZmlsZWlkPTI0NDQ0
https://www.iso.org/files/live/sites/isoorg/files/store/en/PUB100456.pdf