Otfried Cheong Joachim Gudmundsson Hyo-Sil Kim Daria Schymura Fabian Stehn Measuring the Similarity of Geometric Graphs. 101-112 2009 SEA http://dx.doi.org/10.1007/978-3-642-02011-7_11 conf/wea/2009 db/conf/wea/sea2009.html#CheongGKSS09