To cite the 'RobPer' package in publications use:

Thieler, A. M., Rathjens, J. and Fried, R. (2014). The RobPer-package. R package version 1.1.

Thieler, A. M., Fried, R. and Rathjens, J. (2013): RobPer: An R Package to Calculate Periodograms for Light Curves Based on Robust Regression. Technical Report 2, Collaborative Research Center SFB 876, TU Dortmund University, available at http://sfb876.tu-dortmund.de/PublicPublicationFiles/thieler_etal_2013b.pdf

Corresponding BibTeX entries:

  @Manual{,
    title = {The RobPer-package},
    author = {A. M. Thieler and J. Rathjens and R. Fried},
    year = {2014},
    note = {R package version 1.1},
  }
  @TechReport{,
    title = {RobPer: An R Package to Calculate Periodograms for Light
      Curves Based On Robust Regression},
    author = {A. M. Thieler and R. Fried and J. Rathjens},
    year = {2013},
    number = {2},
    institution = {Sonderforschungsbereich 876, TU Dortmund
      University},
    url =
      {http://sfb876.tu-dortmund.de/PublicPublicationFiles/thieler_etal_2013b.pdf},
  }