https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef18036en.pdf
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://www.bbc.com/news/business-41160748
https://theconversation.com/an-entry-fee-may-not-be-enough-to-save-venice-from-20-million-tourists-213703