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Jan 18, 2015 at 2:29 comment added user65993 Prof. Kapovich: Thank you very much for the overview and the reference to the Fisher-Whyte paper, which I did not know. I have accepted this answer as a clear summary of the current state of knowledge: my question is open. I thank all the experts who took time to comment.
Jan 18, 2015 at 2:28 vote accept user65993
Jan 17, 2015 at 2:25 history answered Misha CC BY-SA 3.0