To cite BNPmix in publications use:

  Corradin R, Canale A, Nipoti B (2021). “BNPmix: An R Package for
  Bayesian Nonparametric Modeling via Pitman-Yor Mixtures.” _Journal of
  Statistical Software_, *100*(15), 1-33. doi:10.18637/jss.v100.i15
  <https://doi.org/10.18637/jss.v100.i15>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{BNPmix}: An {R} Package for {B}ayesian Nonparametric Modeling via {P}itman-{Y}or Mixtures},
    author = {Riccardo Corradin and Antonio Canale and Bernardo Nipoti},
    journal = {Journal of Statistical Software},
    year = {2021},
    volume = {100},
    number = {15},
    pages = {1--33},
    doi = {10.18637/jss.v100.i15},
  }