Overviews: Tree Skeletonization

uses Strahler metric

  

[Graph Visualisation in Information Visualisation: a Survey. 
Ivan Herman, Guy Melancon, M. Scott Marshall.  
IEEE Transactions on Visualization and Computer Graphics, 6(1), pp. 24-44, 2000. 
http://citeseer.nj.nec.com/herman00graph.html]

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