Reference:
  Author: Delphine Charif and Jean R. Lobry
  Title: "SeqinR 1.0-2: a contributed package to the R project for statistical computing devoted to biological sequences retrieval and analysis"
  Booktitle: "Structural approaches to sequence evolution: Molecules, networks, populations"
  Editor: Ugo Bastolla and Markus Porto and H. Eduardo Roman and Michele Vendruscolo
  ISBN: 978-3-540-35305-8
  Year: 2007
  Pages: 207-232
  URL: http://link.springer.com/book/10.1007%2F978-3-540-35306-5
