Kaspar Riesen Michel Neuhaus Horst Bunke Bipartite Graph Matching for Computing the Edit Distance of Graphs. 1-12 2007 conf/gbrpr/2007 GbRPR http://dx.doi.org/10.1007/978-3-540-72903-7_1 db/conf/gbrpr/gbrpr2007.html#RiesenNB07