7Coloni A, Dorigo M, Maniezzo V. Ant system: Optimization by a colony of cooperation agent[ J]. IEEE Trans on Systems, Man and Cybernetic- Part B : Cybernetics, 1996,26 ( 1 ) : 29 - 41.
8Dorigo 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.
9Caro G D, Dorigo M. AntNet. Distributed stigmergetic control for communication networks [ J ]. Journal of Artificial Intelh- gence Research, 1998 ( 9 ) :317-355.