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https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1078404/2022-05-25_FINAL_FINDINGS_OF_SECOND_PERMANENT_SECRETARY_INTO_ALLEGED_GATHERINGS.pdf

https://pure.diis.dk/ws/files/3925169/Implications_of_the_Covid_19_pandemic_DIIS_Working_Paper_2020_13.pdf