To cite package ‘npfseir’ in publications use:

  Wang W (2026). _npfseir: Nested Particle Filter for Stochastic SEIR
  Epidemic Models_. R package version 0.2.1,
  <https://CRAN.R-project.org/package=npfseir>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {npfseir: Nested Particle Filter for Stochastic SEIR Epidemic Models},
    author = {Weinan Wang},
    year = {2026},
    note = {R package version 0.2.1},
    url = {https://CRAN.R-project.org/package=npfseir},
  }