To cite package ‘fmx’ in publications use:

  Zhan T (2026). _fmx: Finite Mixture Parametrization_. R package
  version 0.2.0, <https://CRAN.R-project.org/package=fmx>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {fmx: Finite Mixture Parametrization},
    author = {Tingting Zhan},
    year = {2026},
    note = {R package version 0.2.0},
    url = {https://CRAN.R-project.org/package=fmx},
  }