Combinatorics of k-Interval Cospeciation for Cophylogeny
  We show that the cophylogenetic distance, k-interval cospeciation, is distinct from other metrics and accounts for global congruence between locally incongruent trees. The growth of the neighborhood of trees which satisfy the largest possible k-interval cospeciation with a given tree indicates that k-interval cospeciation is useful for analyzing simulated data. 
Jane Ivy Coons and Joseph Rusinko
math.CO q-bio.PE