To cite package ‘semsfa’ in publications use:

  Ferrara G, Vidoli F (2025). _semsfa: Semiparametric Estimation of
  Stochastic Frontier Models_. R package version 1.2,
  <https://CRAN.R-project.org/package=semsfa>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {semsfa: Semiparametric Estimation of Stochastic Frontier Models},
    author = {Giancarlo Ferrara and Francesco Vidoli},
    year = {2025},
    note = {R package version 1.2},
    url = {https://CRAN.R-project.org/package=semsfa},
  }