@unpublished{optimal_distances09,
 author = {Ilan Gronau and Shlomo Moran and Irad Yavneh},
 title = {{Towards Optimal Distance Functions for Stochastic Substitutions Models}},
 note  = {http://www.cs.technion.ac.il/~ilangr/papers/optimal_distances09.pdf (submitted March, 2009)},
}