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http://library.fes.de/pdf-files/dialog/13464.pdf
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/707785/Building_a_Safer_Future_-_web.pdf
https://theconversation.com/politica-negativa-en-el-siglo-xxi-la-influencia-de-la-maquina-de-fango-en-la-esfera-publica-229325