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Apr 4, 2012 at 12:57 vote accept user22518
Apr 4, 2012 at 12:57 comment added user22518 Thank you very much for your answer! I am very surprised that the answer to this question seems to be the main topic of a contemporary research paper. I would have expected that at least the cyclic case would be reasonably doable.
Mar 30, 2012 at 12:15 history answered Tom De Medts CC BY-SA 3.0