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Jun 6, 2011 at 20:37 vote accept Valerio Talamanca
Mar 4, 2011 at 6:27 comment added Valerio Talamanca Thanks, this is similar to the proof I had in mind, still I would like to know if there is a precise reference one can quote for this fact.
Mar 3, 2011 at 16:02 history answered user91132 CC BY-SA 2.5