https://www.ccomptes.fr/system/files/2019-04/20190418-refere-2018-4023-plan-relance-autoroutier.pdf
https://www.exact.com/benl/downloads/finance/whitepaper-cijfers-altijd-het-antwoord
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/966868/BUDGET_2021_-_web.pdf
https://cepr.org/sites/default/files/policy_insights/PolicyInsight91.pdf