Please cite the paper below when using gaga, it took a lot of effort to
develop.

  Rossell D. GaGa: a Parsimonious and Flexible Model for Differential
  Expression Analysis. Annals of Applied Statistics, 3:1035-1051

A BibTeX entry for LaTeX users is

  @Article{,
    author = {Rossell D.},
    title = {GaGa: a Parsimonious and Flexible Model for Differential Expression Analysis},
    journal = {Annals of Applied Statistics},
    year = {2009},
    volume = {3},
    pages = {1035-1051},
  }