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Mar 16, 2012 at 21:26 vote accept Russell May
Mar 16, 2012 at 21:10 answer added Ira Gessel timeline score: 6
Mar 16, 2012 at 19:37 comment added Chris Godsil The paper gives email addresses for each author. You could try contacting them
Mar 16, 2012 at 17:01 history asked Russell May CC BY-SA 3.0