Matthew Dickerson David Eppstein Michael T. Goodrich Jeremy Yu Meng Confluent Drawings: Visualizing Non-planar Diagrams in a Planar Way. 1-12 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2912&spage=1 2003 conf/gd/2003 Graph Drawing db/conf/gd/gd2003.html#DickersonEGM03