Reference:
  Author: Michael Höhle
  Title: "Surveillance: An R package for the surveillance of infectious diseases"
  Journal: Computational Statistics
  Year: 2007
  Volume: 22
  Number: 4
  Pages: 571--582
  DOI: 10.1007/s00180-007-0074-8
  URL: http://www.springerlink.com/content/a230702725x33r46
  eprint: http://www.springerlink.com/content/a230702725x33r46/fulltext.pdf
