Reference:
  Author: Tatiana Benaglia and Didier Chauveau and David R. Hunter and Derek Young
  Title: "mixtools: An R Package for Analyzing Finite Mixture Models"
  Journal: Journal of Statistical Software
  Year: 2009
  Volume: 32
  Number: 6
  Pages: 1-29
  URL: http://www.jstatsoft.org/v32/i06/
  Eprint: http://www.jstatsoft.org/v32/i06/paper

