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2. 2Polmear,I.,LightAlloys:FromTraditionalAlloystoNanocrystals,FourthEdition,Butterworth-Heinemann,2006.
3. 3The International Aluminium Institute, "Aerospace", About Aluminium, http://www.worldaluminium.org/applications/transport/aerospace.html, [cited 24May2007].
4. The challenge of reducing both airframe weight and manufacturing cost