Reference:
  Author: Paschalia Kapli and Sarah Lutteropp and Jiajie Zhang and Kassian Kobert and Pavlos Pavlidis and Alexandros Stamatakis and Tomas Flouri
  Title: "Multi-rate Poisson Tree Processes for single-locus species delimitation under Maximum Likelihood and Markov Chain Monte Carlo"
  Journal: bioRxiv
  Year: 2016
  DOI: 10.1101/063875
  PMID:     28108445
  URL: http://biorxiv.org/content/early/2016/07/14/063875
  eprint: http://biorxiv.org/content/early/2016/07/14/063875.full.pdf
