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8Li Deyi,Liu Changyu,Gan Wenyan.A New Cognitive Model:Cloud Model[J].International Journal of Intelligent Systems,2009,24(4):357-375.
9Bentley P J,Greensmith J,Ujjin S.Two Ways to Grow Tissue for Artificial Immune Systems[C] ∥Proc of the 4th Int'l Conf on Artificial Immune Systems,2005:139-152.