Reference:
  Author: Derrick E Wood and Steven L Salzberg
  Title: "Kraken: ultrafast metagenomic sequence classification using exact alignments"
  Journal: Genome Biol.
  Year: 2014
  Volume: 15
  Number: 3
  Pages: R46
  DOI: 10.1186/gb-2014-15-3-r46
  PMID: 24580807
  URL: http://www.genomebiology.com/2014/15/3/R46
  eprint: http://www.genomebiology.com/content/pdf/gb-2014-15-3-r46.pdf
