2[4]J.J.HOPFIELD and D.W.Tank,Neural computation of decision in optimization problems Biol.Cybern.,No.52,pp.141-152,1985
3[5]Ma Liang,CuiXueli & Yao Jian,Finding the Minimum Ratio Traveling Salesman Tour by Artificial Ants,Systems Engineering and Electronics,Vol.14,No.3,2003,pp.24～ 27
