
https://theconversation.com/dna-says-youre-related-to-a-viking-a-medieval-german-jew-or-a-1700s-enslaved-african-what-a-genetic-match-really-means-222833

https://www.associationofcatholicpriests.ie/2018/08/speeches-by-an-taoiseach-mr-leo-varadkar-and-pope-francis-in-dublin-castle/

https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef18002en.pdf