To cite package imprProbEst in publications use:

Hable, R. (2008). imprProbEst: Minimum distance estimation in an imprecise probability model. R package.

Corresponding BibTeX entry:

  @Manual{,
    title = {imprProbEst: Minimum distance estimation in an imprecise
      probability model},
    author = {R. Hable},
    language = {English},
    year = {2008},
    type = {R package},
  }