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2. Alhajji, A.F., 2007. What Is Energy Security? Definitions And Concepts. Middle East Economic Survey VOL. L No 45 5-November-2007. On 20-2-2008 available at 〈http://www.mees.com/postedarticles/oped/v50n45-5OD01.htm〉.
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5. Portfolio based electricity generation planning: policy implementations for renewables and energy security;Awerbuch;Mitigation and Adaptation Strategies for Global Change,2006