Reference:
  Title = "R/qtl: QTL mapping in experimental crosses"
  Author = Karl W. Broman, Hao Wu, Saunak Sen, Gary A. Churchill, 
  Year = 2003
  Journal = Bioinformatics
  Volume = 19
  Pages = 889-890
  PMID = 12724300
  DOI = 10.1093/bioinformatics/btg112
  eprint = http://bioinformatics.oxfordjournals.org/content/19/7/889.full.pdf+html
