7Parr R,Russell S.Reinforcement learning with hierarchies of machines[J].In:Proc.Advances in Neural Information Processing Systems 10.Cambridge,MA:MIT Press,1998:1043-1049.
8Xias hixiong,Li Wenchao,Zhou yong Zhang,Niu Qiang.Improved k-means clustering algorithm[J].Journa of Southeast University (English Edition),2007,(3):435-438.