Matthew Dickerson David Eppstein Michael T. Goodrich Jeremy Yu Meng Confluent Drawings: Visualizing Non-planar Diagrams in a Planar Way. 31-52 2005 9 J. Graph Algorithms Appl. 1 http://jgaa.info/accepted/2005/Dickerson+2005.9.1.pdf db/journals/jgaa/jgaa9.html#DickersonEGM05