To cite package ‘GSRI’ in publications use:

  Julian Gehring, Kilian Bartholome, Clemens Kreutz, Jens Timmer ():
  Gene Set Regulation Index (GSRI). Institute of Physics and Freiburg
  Center for Data Analysis and Modeling, University of Freiburg,
  Germany. R package version 2.53.0.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Gene Set Regulation Index (GSRI)},
    author = {Julian Gehring and Kilian Bartholome and Clemens Kreutz and Jens Timmer},
    note = {R package version 2.53.0},
  }