1COLORNI A, DORIGO M, MANIEZZO V. Distributed Optimization by Ant Colonies [ C ]. //Proc of 1^st European Conf. Artificial Life. Pans, France: Elsevier, 1991: 134-142.
2COLORNI A, DORIGO M, MANIEZZO V, et al. Ant System for Job Shop Scheduling [ J ]. Belgian J. of Operations Research Statistics and Computer Science, 1994,34 ( 1 ) :39-53.
3DORIGO M, MANIEZZO V, COLORNI A. Ant System: Optimization by a Colony of Cooperating Agents [ J ]. IEEE Trans. on Systems,Man and Cybernatics, 1996,26 ( 1 ) :28-41.
4COSTA D, HERTZ A. Ants Can Colour Graphs [ J ]. Journal of the Operational Research Society, 1997,48 ( 3 ) :295-305.
6Ariel S, Amir S. Skeleton Based on Solid Represen- tation with Topology Preservation [J]. Graphical Models. 2006,68= 307-a21.
7I.am L, Lee S W. Suen C Y. Thinning Methodolo- gies-acomprehensive Survey [J]. IEEE Trans Pat- tern Analysis and Machine Intelligence, 1992, 14(9) : 869-885.
8Singh S, Amin A. Neural Network Recognition of Hand-printed Characters[J]. Neural Computer and Application, 1999, 8: 67-76.
9Lam L,Lee S Suen C Y. Thinning Methodologies-a Comprehensive Survey[J]. IEEE Transactions onPattern Analysis and Machine Intelligence . 1992 .14(9) : 869-885.
10Hilditch C J. Comparison of Thinning Algorithmson a Parallel Processor[J]. Image and Vision Com-puting , 1983,1(3) : 115-132.