https://sgp.fas.org/crs/natsec/RL33110.pdf
http://www.nationalcrimeagency.gov.uk/publications/890-the-cyber-threat-to-uk-business-2017-2018/file
https://www.eca.europa.eu/Lists/ECADocuments/SR21_08/SR_Frontex_EN.pdf
https://rusi.org/sites/default/files/20181107_newsbrief_vol38_no10_chalmers_and_stefanovich_web.pdf