A quick google search gave me these (this and this which look promising) and also lead me to this, which should also prove useful.

C-.

Update:My final suggestion, as I mentioned below, would be to talk to some of the people at Journal of Graph Algorithms and Applications. Someone like Mihalis Yannakakis, I mean, check out the first publication on his bibliography.

In reply to Re: Distance among trees by cacharbe
in thread Distance among trees by jmerelo

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