To cite package ‘iimm’ in publications use:

Elff M (2018). iimm: Improved Infrence for Multilevel Models with Few Clusters. R package version 0.1, https://github.com/melff/iimm.

Corresponding BibTeX entry:

  @Manual{,
    title = {iimm: Improved Infrence for Multilevel Models with Few
      Clusters},
    author = {Martin Elff},
    year = {2018},
    note = {R package version 0.1},
    url = {https://github.com/melff/iimm},
  }