To cite package ‘metafrontier’ in publications use:

  Enstad E (2026). _metafrontier: Analysis of Metafrontier Models for
  Efficiency and Productivity_. R package version 0.2.1,
  <https://github.com/iik1/metafrontier>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {metafrontier: Analysis of Metafrontier Models for Efficiency and Productivity},
    author = {Erik Enstad},
    year = {2026},
    note = {R package version 0.2.1},
    url = {https://github.com/iik1/metafrontier},
  }