https://www.persee.fr/doc/rfeco_0769-0479_1995_num_10_2_978
https://www.eca.europa.eu/Lists/ECADocuments/SR22_17/SR_External_consultants_EN.pdf
https://www.huffingtonpost.co.uk/entry/test-and-trace-spending-ps37bn-budget-small-print_uk_60412920c5b601179ec35d4a
https://knowledge.wharton.upenn.edu/article/why-are-the-markets-collapsing-how-bad-will-covid-19-really-be/?utm_source=kw_newsletter&utm_medium=email&utm_campaign=2020-03-17