Reference:
  Author: S. Deorowicz and M. Kokot and Sz. Grabowski and A. Debudaj-Grabysz
  Title: "KMC 2: Fast and resource-frugal k-mer counting"
  Journal: Bioinformatics
  Year: 2015
  Volume: 31
  Number: 10
  Pages: 1569-1576
  DOI: 10.1093/bioinformatics/btv022
  PMID: 25609798
  URL: http://bioinformatics.oxfordjournals.org/content/31/10/1569
