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Apr 29, 2017 at 0:19 history edited Joseph O'Rourke CC BY-SA 3.0
Image link broken; now fixed.
May 27, 2012 at 19:45 comment added Arnab Prof. O'Rourke, that is a beautiful modern reference; thanks very much.
May 27, 2012 at 19:24 vote accept Arnab
May 26, 2012 at 0:28 history answered Joseph O'Rourke CC BY-SA 3.0