1. U.S. Department of Homeland Security, National Infrastructure Protection Plan, Washington, DC, 2009.
2. Council of the European Union, On the identification and designation of European critical infrastructures and the assessment of the need to improve their protection, Council Directive 2008/114/EC, Official Journal of the European Union, L 345/75, 2008.
3. Methodologies and applications for critical infrastructure protection: State-of-the-art;Yusta;Energy Policy,2011
4. Commission of the European Communities, Green Paper on a European Programme for Critical Infrastructure Protection, COM(2005) 576 Final, Brussels, Belgium, November 17, 2005.
5. U.S. Department of Homeland Security, Government Facilities: Critical Infrastructure and Key Resources Sector-Specific Plan as Input to the National Infrastructure Protection Plan, Washington, DC, 2007.