1. Assante, M., J., Infrastructure Protection in the Ancient World, 2009, Proceedings of the 42nd Hawaii International Conference on System Sciences. https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.401.7316&rep=rep1&type=pdf, 14 March 2022.
3. COUNCIL DIRECTIVE 2008/114/EC of 8 December 2008 on the Identification and Designation of European Critical Infrastructures and the Assessment of the Need to Improve their Protection, Article 2(a), 2008. https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=uriserv%3AOJ.L_.2008.345.01.0075.01.ENG&toc=OJ%3AL%3A2008%3A345%3ATOC, 10 March 2022.
4. Ehlen, M. A., Critical Infrastructure Interdependencies, Researchgate.net, 2013. https://www.researchgate.net/figure/Critical-Infrastructure-Interdependencies_fig3_257560357, 15 March 2022.
5. ENISA, Critical Information Infrastructures, 2021. https://www.enisa.europa.eu/topics/critical-information-infrastructures-and-services/cii?tab=details, 10 March 2022.
10. EUR-Lex, Document 32016L1148, Directive (EU) 2016/1148 of the European Parliament and of the Council of 6 July 2016 concerning Measures for a High Common Level of Security of Network and Information Systems across the Union. https://eur-lex.europa.eu/eli/dir/2016/1148/oj, 16 March 2022.
11. European Commission, NATO and CERT-EU Discuss Cyber Threats ahead of EU Elections, 2019. https://ec.europa.eu/info/news/nato-and-cert-eu-discuss-cyber-threats-ahead-eu-elections-2019-may-06_en, 26 March 2022.
12. European Parliament, The NIS2 Directive - A High Common Level of Cybersecurity in the EU, 2021. https://www.europarl.europa.eu/RegData/etudes/BRIE/2021/689333/EPRS_BRI(2021)689333_EN.pdf, 17 March 2022.
13. HSD Securitydelta.nl, NATO and the European Union Enhance Cyber Defence Cooperation, 2016. https://securitydelta.nl/news/newsitem/587-nato-and-the-european-union-enhance-cyber-defence-cooperation, 26 March 2022.
14. INSIDER, Photos: How Facebook and Google use sonar ships, gigantic underwater plows, and divers to lay thousands of miles of undersea internet cables around the globe, 2021. https://www.businessinsider.com/google-facebook-giant-undersea-cables-internet-tech-2021-9, 9 March 2022.
15. Lockheed Martin Corporation, Seven Ways to Apply the Cyber Kill Chain® with a Threat Intelligence Platform, 2015. https://www.lockheedmartin.com/content/dam/lockheed-martin/rms/documents/cyber/Seven_Ways_to_Apply_the_Cyber_Kill_Chain_with_a_Threat_Intelligence_Platform.pdf, 14 March 2022.
17. RIA - Republic of Estonia Information System Authority, Critical Information Infrastructure Protection CIIP, 2021.https://www.ria.ee/en/cyber-security/critical-information-infrastructure-protection-ciip.html, 10 March 2022.
18. Ruonavar, F. P., DISA Task Critical Asset Nomination Process, 2018. https://www.disa.mil/-/media/Files/DISA/News/Events/Symposium/1---Rounavar_DISA-Task-Critical-Asset-Nomination-Process_approved-FINAL.ashx, 10 March 2022.
19. SANS, The Industrial Control System Cyber Kill Chain, 2015.https://na-production.s3.amazonaws.com/documents/industrial-control-system-cyber-kill-chain-36297.pdf, 14 March 2022.
21. UK Cabinet Office, the National Cyber Security Centre (NCSC), and the Centre for the Protection of National Infrastructure (CPNI), Improving our Understanding of Critical National Infrastructure, 2020. file:///C:/Users/henrik.beckvard/Downloads/CNI%20 Criticalities%20KB%20Flyer%20(2).pdf, 14 March 2022.
22. UK Centre for the Protection of National Infrastructure (CPNI), Critical National Infrastructure, 2021. https://www.cpni.gov.uk/critical-national-infrastructure-0, 9 March 2022.
23. US Department for Homeland Security, National Infrastructure Protection Plan (NIPP) – Partnering for Critical Infrastructure Security and Resilience, 2013, p 15. https://www.cisa.gov/sites/default/files/publications/national-infrastructure-protection-plan-2013-508.pdf, 11 March 2022.
25. US Patriot Act, PUBLIC LAW 107–56—OCT. 26, 2001, UNITING AND STRENGTHENING AMERICA BY PROVIDING APPROPRIATE TOOLS REQUIRED TO INTERCEPT AND OBSTRUCT TERRORISM (USA PATRIOT ACT) ACT OF 2001, P.L. 107-56, §1016(e), 2001. https://www.govinfo.gov/content/pkg/PLAW-107publ56/pdf/PLAW-107publ56.pdf, 10 March 2022.