1. Digraphs. Theory, Algorithms and Applications;Bang-Jensen,2000
2. Dynamic Programming;Bellman,1957
3. H. Bunke, G. Allermann, A metric on graphs for structural pattern recognition, in: H.W. Schussler (Ed.), SIGNAL PROCESSING II: Theory and Applications, 1983, pp. 257–260.
4. H. Bunke, Graph matching: theoretical foundations, algorithms, and applications, in: Proceedings of the Vision Interface 2000, Montreal/Canada, 2000, pp. 82–88.
5. H. Bunke, Recent developments in graph matching, in: Proceedings of the 15th International Conference on Pattern Recognition, Barcelona/Spain, 2000, vol. 2, pp. 117–124.