http://www.fdf.org.uk/news.aspx?article=7834
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/994125/FINAL_TIGRR_REPORT__1_.pdf
https://ec.europa.eu/commission/presscorner/detail/en/ip_20_1968
https://www.socialeurope.eu/tourism-in-southern-europe-potential-and-perils