Reference:
  Author: Ryan R. Newton and Irene L.G. Newton
  Title: "PhyBin: binning trees by topology"
  Journal: PeerJ
  Year: 2013
  Volume: 1
  Pages: e187
  DOI: 10.7717/peerj.187
  PMID: 24167782
  URL: https://peerj.com/articles/187/
  eprint: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3807594/pdf/peerj-01-187.pdf
