More on migrants

https://www.interno.gov.it/it/temi/immigrazione-e-asilo/sistema-accoglienza-sul-territorio/centri-limmigrazione

https://www.pewresearch.org/fact-tank/2019/11/14/5-facts-about-unauthorized-immigration-in-europe/

https://www.piuculture.it/2020/05/chi-sono-e-quanti-sono-gli-immigrati-irregolari-dati/

https://www.infodata.ilsole24ore.com/2018/07/14/immigrazione-irregolare-quanti-clandestini/?refresh_ce=1

https://www.pewresearch.org/global/2019/11/13/europes-unauthorized-immigrant-population-peaks-in-2016-then-levels-off/

https://www.pewresearch.org/2019/11/15/video-estimating-europes-unauthorized-immigrant-population/

https://www.theguardian.com/world/2019/nov/13/4m-unauthorised-immigrants-in-europe-in-2017-study

https://migrationdataportal.org/regional-data-overview/europe

https://migrationdataportal.org/data?i=stock_abs_&t=2019&cm49=380

https://www.thenewhumanitarian.org/news-feature/2020/11/17/europe-italy-bosnia-slovenia-migration-pushbacks-expulsion

https://www.schengenvisainfo.com/news/19-decrease-in-illegal-crossings-at-eus-external-borders-in-october/

https://ec.europa.eu/eurostat/statistics-explained/pdfscache/1275.pdf

https://www.globaldetentionproject.org/countries/europe/italy