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when toggle format what by license comment
Sep 26, 2021 at 17:17 history made wiki Post Made Community Wiki by Stefan Kohl
Mar 11, 2013 at 19:59 comment added Jeff Harvey I added a few early references.
Mar 11, 2013 at 19:59 history edited Jeff Harvey CC BY-SA 3.0
added references
Mar 11, 2013 at 17:56 comment added Ian Agol Some references would make your answer more useful.
Mar 11, 2013 at 7:09 history answered Jeff Harvey CC BY-SA 3.0