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2DHS CSSP. Recommended Practice:Improving Industrial Control Systems Cybersecurity with Defense-In-Depth Strategies[OL].http://www.us-cer t.gov/control_systems/practices/documents/Defense in Depth_Oct09.pdf,2009.
4DHS CSSP. Common Cyber Security Vulnerabilities in Industrial Control Systems[OL].http://www.us-cert.gov/control_systems/practices/documents/DHS_Common_Cybersecurity_Vulner abilities_ICS_2010.pdf,2011.