To cite package ‘slim’ in publications use:

  Farewell D (2026). _slim: Singular Linear Models for Longitudinal
  Data_. R package version 0.1.3,
  <https://CRAN.R-project.org/package=slim>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {slim: Singular Linear Models for Longitudinal Data},
    author = {Daniel Farewell},
    year = {2026},
    note = {R package version 0.1.3},
    url = {https://CRAN.R-project.org/package=slim},
  }