Reference:
  Author: Stephen A. Smith and Casey W. Dunn
  Title: "Phyutility: a phyloinformatics utility for trees, alignments, and molecular data"
  Journal: Bioinformatics
  Year: 2008
  Volume: 24
  Number: 5
  Pages: 715-716
  DOI: 10.1093/bioinformatics/btm619
  PMID: 18227120
  URL: http://bioinformatics.oxfordjournals.org/content/24/5/715
  eprint: http://bioinformatics.oxfordjournals.org/content/24/5/715.full.pdf+html
