1. President’s Commission on Critical Infrastructure Protection, Critical Foundations, Protecting Americas Infrastructures (1997). [Online] http://www.fas.org/sgp/library/pccip.pdf.
2. North American Electric Reliability Corporation, Results of the 2007 Survey of Reliability Issues (2007). [Online] http://www.nerc.com/files/Reliability_Issue_Survey_Final_Report_Rev.1.pdf.
3. U.S. DOE (2002) [Online] http://www.pi.energy.gov/documents/TransmissionGrid.pdf.
4. U.S. DOE, Overview of the Electric Grid. [Online] http://sites.energetics.com/gridworks/grid.html.
5. Power-System Reliability Calculations;Billinton,1973