From: ted.dunning@gmail.com   
      
   I am not an ace on these algorithms.  The key words that you need are   
   planar layout, planarization and graph layout.   
      
   A quick google indicates that there are some excellent references on   
   the subject (if you use planar layout or planarization as the search).   
      
   Spring layout as a search gives you many references to variants on the   
   Kamada-style algorithms such as are used in the well-known Java spring   
   layout demo, but doesn't give you information on other layout and   
   planarization algorithms.   
      
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