https://www.dgb-bestellservice.de/besys_dgb/pdf/DGB15130.pdf
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.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef18036en.pdf