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2. www.zipcar.com (accessed November 14, 2011).
3. IEEE Accelerated Stress Testing and Reliability Workshop;Smith,2010
4. Conversation with Mike Ferry, California Center for Sustainable Energy, 8 December 2011.
5. Annual Energy Outlook 2011 With Projections to 2035, U.S. Energy Information Administration, DOE/EIA-0383(2011), April 2011.