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2. Arizona-southern California Outages on September 8, 2011: Causes and Recommendations;FERC,2012
3. Unprecedented outage left millions in the dark;Burgin;San Diego Union-Tribune,2011
4. Economic Impact of September 9th Power Outage: Conservatively Estimated at $97 to $118 Million;NUSIPR,2011
5. Egypt cuts off most internet and cell service;Richtel;New York Times,2011