To cite package ‘PFIM’ in publications use:

  Mentré F, Leroux R, Seurat J, Fayette L (2024). _PFIM: Population
  Fisher Information Matrix_. R package version 6.1,
  <https://CRAN.R-project.org/package=PFIM>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {PFIM: Population Fisher Information Matrix},
    author = {France Mentré and Romain Leroux and Jérémy Seurat and Lucie Fayette},
    year = {2024},
    note = {R package version 6.1},
    url = {https://CRAN.R-project.org/package=PFIM},
  }