To cite package ‘nntmvn’ in publications use:

  Jian Cao, Matthias Katzfuss (2025). _nntmvn: Draw Samples of
  Truncated Multivariate Normal Distributions_. R package version
  1.2.0, <https://CRAN.R-project.org/package=nntmvn>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {nntmvn: Draw Samples of Truncated Multivariate Normal Distributions},
    author = {{Jian Cao} and {Matthias Katzfuss}},
    year = {2025},
    note = {R package version 1.2.0},
    url = {https://CRAN.R-project.org/package=nntmvn},
  }