To cite package ‘msmtools’ in publications use:

  Grossetti F (2026). _msmtools: Building Augmented Data to Run
  Multi-State Models with 'msm' Package_. R package version 2.2.1,
  <https://CRAN.R-project.org/package=msmtools>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {msmtools: Building Augmented Data to Run Multi-State Models with 'msm'
Package},
    author = {Francesco Grossetti},
    year = {2026},
    note = {R package version 2.2.1},
    url = {https://CRAN.R-project.org/package=msmtools},
  }