Reference:
  Author: Michael Lawrence and Robert Gentleman and "Vincent Carey
  Title: "rtracklayer: an R package for interfacing with genome browsers"
  Journal: Bioinformatics
  Year: 2009
  Volume: 25
  Number: 14
  Pages: 1841-1842
  DOI: 10.1093/bioinformatics/btp328
  PMID: 19468054
  URL: http://bioinformatics.oxfordjournals.org/content/25/14/1841.abstract
  eprint: http://bioinformatics.oxfordjournals.org/content/25/14/1841.full.pdf+html
