9Solso Robert L, MacLin Kimberly M, MacLin Otto H. Cognitive psychology [ M 1.7th ed. Beijing: Peking University Press ,2005 : 104-139.
10Jain A K, Duin Robert P W, Mao Jian-chang. Statistical pattern recognition a review [ J ]. IEEE Transaction on Pattern Analysis and Machine Intelligence,2000,22( 1 ) : 4-37.