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Rui Tang Fengming Zhang Yong-Bin Kim QCA-based nano circuits design [adder design example]. 2527-2530 2005 conf/iscas/2005 ISCAS (3) http://dx.doi.org/10.1109/ISCAS.2005.1465140 db/conf/iscas/iscas2005-3.html#TangZK05