
http://www.express.co.uk/news/uk/840143/DNA-English-villages-foreigners-residents-study

https://gisanddata.maps.arcgis.com/apps/opsdashboard/index.html?fbclid=IwAR0dSCCOIXwL78pt0tf8MhK2CGkPPzX3djf7rSWY-tlKUWyEfV8Ui7Fmg-4#/bda7594740fd40299423467b48e9ecf6

https://www.brookings.edu/wp-content/uploads/2018/02/leave-no-country-behind_global-working-paper.pdf