To cite package RobRex in publications use:

Kohl, M. (2009). RobRex: Optimally robust influence curves for regression and scale. R package version 0.7. URL http://robast.r-forge.r-project.org/

Corresponding BibTeX entry:

  @Manual{,
    title = {RobRex: Optimally robust influence curves for regression
      and scale},
    author = {M. Kohl},
    language = {English},
    year = {2009},
    note = {R package version 0.7},
    type = {R package},
    url = {http://robast.r-forge.r-project.org/},
  }