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Jun 28, 2011 at 13:03 vote accept Sam Derbyshire
Jun 3, 2011 at 18:27 comment added darij grinberg arxiv.org/abs/math/0401326 This is probably more up-to-date, as it is a version 2 and the date is 2004.
Jun 3, 2011 at 17:43 history answered Bruce Westbury CC BY-SA 3.0