8Dorigo M, et al.. Ant system : optimization by a colony of cooperating agents [J ]. IEEE Transactions on Systems, Man, and Cybernetics, PartB, 1996, 26( 1 ) : 29-61.
9Dorigo M, Gambardella L M. Ant colony system: a cooperative learning approach to the traveling salesman problem [J]. IEEE Transactions on Evolutionary Computation, 1997, 1 (1) : 53-66.
10Gambardella L M, Dorigo M. An ant colony system hybridized with a new local search for the sequential ordering problem [ J ]. Informs Journal on Computing, 2000, 12(3) : 237-255.