@InProceedings{DBLP:conf/gd/NorthW01,
   title = {Online Hierarchical Graph Drawing},
   author = {Stephen C. North and Gordon Woodhull},
   year = 2001,
   BookTitle = {Graph Drawing},
   att_url = {http://www2.research.att.com/areas/visualization/papers_videos/pdf/DBLP-conf-gd-NorthW01.pdf},
   att_abstract_url = {abstracts/DBLP-conf-gd-NorthW01.txt}
}