2Dorigo M, Maniezzo V, Colorni A. Ant system:optimization by a colony of cooperative agents [ J ].IEEE Trans on Systems, Man, and Cybernetics,1996, 26(1): 29～41.
3Dorigo M, Gambardella L M. Ant colony system: a cooperative learning approach to the traveling salesman problem [J]. IEEE Trans on Evolutionary Computation, 1997, 1(1): 53～66.
