Pak Chung Wong Harlan Foote George Chin Jr. Patrick Mackey Ken Perrine Graph Signatures for Visual Analytics. 1399-1413 2006 12 IEEE Trans. Vis. Comput. Graph. 6 http://doi.ieeecomputersociety.org/10.1109/TVCG.2006.92 db/journals/tvcg/tvcg12.html#WongFCMP06