To cite package ROptEst in publications use:

Kohl M, Ruckdeschel P (2022). ROptEst: Optimally robust estimation. R package version 1.3.1, http://robast.r-forge.r-project.org/.

Corresponding BibTeX entry:

  @Manual{,
    title = {ROptEst: Optimally robust estimation},
    author = {M. Kohl and P. Ruckdeschel},
    language = {English},
    year = {2022},
    note = {R package version 1.3.1},
    type = {R package},
    url = {http://robast.r-forge.r-project.org/},
  }