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3. Critical Infrastructure Sectors, US Cybersecurity & Infrastructure Security Agency, 24 Mar 2020 [Online]. Last accessed 25 Aug 2021. Available at https://www.cisa.gov/critical-infrastructure-sectors. Accessed Aug 2021
4. Green paper on a European program for Critical Infrastructure protection (2005) [Online]. Last accessed 24 Aug 2021. Available at https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:52005DC0576&from=EN. Accessed Aug 2021
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