To cite package ‘breathteststan’ in publications use:

  Menne D (2025). _breathteststan: Stan-Based Fit to Gastric Emptying
  Curves_. R package version 0.8.9,
  <https://CRAN.R-project.org/package=breathteststan>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {breathteststan: Stan-Based Fit to Gastric Emptying Curves},
    author = {Dieter Menne},
    year = {2025},
    note = {R package version 0.8.9},
    url = {https://CRAN.R-project.org/package=breathteststan},
  }